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Epidemiology

Beschreibung

Masters Degree Epidemiology Quiz am Epidemiology, erstellt von Maria Margarita Samson am 01/12/2017.
Maria Margarita Samson
Quiz von Maria Margarita Samson, aktualisiert more than 1 year ago
Maria Margarita Samson
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Zusammenfassung der Ressource

Frage 1

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In the definition of epidemiology, "distribution" refers to EXCEPT:
Antworten
  • Who
  • When
  • Where
  • Why

Frage 2

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In the definition of epidemiology, "determinants" generally includes EXCEPT:
Antworten
  • Agents
  • Causes
  • Control measures
  • Risk factors
  • Sources

Frage 3

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Epidemiology, as defined in this lesson, would NOT include which of the following activities?
Antworten
  • Describing the demographic characteristics of persons with acute aflatoxin poisoning in District A
  • Prescribing an antibiotic to treat a patient with community-acquired methicillin-resistantStaphylococcus aureus infection
  • Comparing the family history, amount of exercise, and eating habits of those with and without newly diagnosed diabetes
  • Recommending that a restaurant be closed after implicating it as the source of a hepatitis A outbreak

Frage 4

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John Snow's investigation of cholera is considered a model for epidemiologic field investigations because it includes the following EXCEPT:
Antworten
  • Biologically plausible hypothesis
  • Comparison of a health outcome among exposed and unexposed groups
  • Multivariate statistical model
  • Spot map
  • Recommendation for public health action

Frage 5

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Public health surveillance does NOT include which of the following activity:
Antworten
  • Diagnosing whether a case of encephalitis is actually due to West Nile virus infection
  • Soliciting case reports of persons with symptoms compatible with SARs from local hospitals
  • Creating graphs of the number of dog bites by week and neighborhood
  • Writing a report on trends in seat belt use to share with the state legislature
  • All of the above
  • None of the above

Frage 6

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The hallmark feature of an analytic epidemiologic study is:
Antworten
  • Use of an appropriate comparison group
  • Laboratory confirmation of the diagnosis
  • Publication in a peer-reviewed journal
  • Statistical analysis using logistic regression

Frage 7

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A number of passengers on a cruise ship from Puerto Rico to the Panama Canal have recently developed a gastrointestinal illness compatible with norovirus (formerly called Norwalk-like virus). Testing for norovirus is not readily available in any nearby island, and the test takes several days even where available. Assuming you are the epidemiologist called on to board the ship and investigate this possible outbreak, your case definition should include, at a minimum:
Antworten
  • Clinical criteria, plus specification of time, place, and person
  • Clinical features, plus the exposure(s) you most suspect
  • Suspect cases
  • The nationally agreed standard case definition for disease reporting

Frage 8

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Compare food histories between persons with Staphylococcus food poisoning and those without
Antworten
  • Distribution
  • Determinants
  • Application

Frage 9

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Compare frequency of brain cancer among anatomists with frequency in general population
Antworten
  • Distribution
  • Determinants
  • Application

Frage 10

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Mark on a map the residences of all children born with birth defects within 2 miles of a hazardous waste site
Antworten
  • Distribution
  • Determinants
  • Application

Frage 11

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Graph the number of cases of congenital syphilis by year for the country
Antworten
  • Distribution
  • Determinants
  • Application

Frage 12

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Recommend that close contacts of a child recently reported with meningococcal meningitis receive Rifampin
Antworten
  • Distribution
  • Determinants
  • Application

Frage 13

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Tabulate the frequency of clinical signs, symptoms, and laboratory findings among children with chickenpox in Cincinnati, Ohio
Antworten
  • Distribution
  • Determinants
  • Application

Frage 14

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Essay entitled “On Airs, Waters, and Places,” suggested that environmental and host factors such as behaviors
Antworten
  • Hippocrates
  • John Graunt
  • John Snow

Frage 15

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first to quantify patterns of birth, death, and disease occurrence, noting disparities between males and females, high infant mortality, urban/rural differences, and seasonal variations
Antworten
  • John Graunt
  • John Snow
  • William Farr

Frage 16

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Father of modern vital statistics and surveillance
Antworten
  • William Farr
  • John Snow
  • John Graunt

Frage 17

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Father of field epidemiology
Antworten
  • John Graunt
  • John Snow
  • William Farr

Frage 18

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Study linking lung cancer to smoking
Antworten
  • Doll and Hill
  • John Snow
  • Kannel

Frage 19

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Reviewing reports of test results for Chlamydia trachomatis from public health clinics
Antworten
  • Public health surveillance
  • Field investigation
  • Analytic studies
  • Evaluation
  • Linkages
  • Policy development

Frage 20

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Meeting with directors of family planning clinics and college health clinics to discuss Chlamydia testing and reporting
Antworten
  • Public health surveillance
  • Analytic studies
  • Evaluation
  • Field investigation
  • Linkages
  • Policy development

Frage 21

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Developing guidelines/criteria about which patients coming to the clinic should be screened (tested) for Chlamydia infection
Antworten
  • Public health surveillance
  • Field investigation
  • Analytic studies
  • Evaluation
  • Linkages
  • Policy development

Frage 22

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Interviewing persons infected with Chlamydia to identify their sex partners
Antworten
  • Public health surveillance
  • Field investigation
  • Analytic studies
  • Evaluation
  • Linkages
  • Policy development

Frage 23

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Conducting an analysis of patient flow at the public health clinic to determine waiting times for clinic patients
Antworten
  • Public health surveillance
  • Analytic studies
  • Evaluation
  • Linkages
  • Policy development
  • Field investigation

Frage 24

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Comparing persons with symptomatic versus asymptomatic Chlamydia infection to identify predictors
Antworten
  • Public health surveillance
  • Field investigation
  • Evaluation
  • Linkages
  • Policy development
  • Analytic studies

Frage 25

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Comparing numbers and rates of illness in a community, rates are preferred for
Antworten
  • Conducting surveillance for communicable diseases
  • Deciding how many doses of immune globulin are needed
  • Estimating subgroups at highest risk
  • Telling physicians which strain of influenza is most prevalent

Frage 26

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For the cruise ship scenario described in Question 7, how would you display the time course of the outbreak?
Antworten
  • Endemic curve
  • Epidemic curve
  • Seasonal trend
  • Secular trend

Frage 27

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For the cruise ship scenario described in Question 7, if you suspected that the norovirus may have been transmitted by ice made or served aboard ship, how might you NOT display "place"?
Antworten
  • Spot map by assigned dinner seating location
  • Spot map by cabin
  • Shaded map of United States by state of residence
  • Shaded map by whether passenger consumed ship's ice or no

Frage 28

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Which variables might you include in characterizing the outbreak described in Question 7 by person?
Antworten
  • Age of passenger
  • Detailed food history (what person ate) while aboard ship
  • Status as passenger or crew
  • Symptoms

Frage 29

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When analyzing surveillance data by age, which of the following age groups is preferred?
Antworten
  • 1-year age groups
  • 5-year age groups
  • 10-year age groups
  • Depends on the disease

Frage 30

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A study in which children are randomly assigned to receive either a newly formulated vaccine or the currently available vaccine, and are followed to monitor for side effects and effectiveness of each vaccine, is an example of which type of study?
Antworten
  • Cohort
  • Case-control
  • Clinical trial
  • Cross Sectional

Frage 31

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The Iowa Women's Health Study, in which researchers enrolled 41,837 women in 1986 and collected exposure and lifestyle information to assess the relationship between these factors and subsequent occurrence of cancer, is an example of which type(s) of study?
Antworten
  • Cohort
  • Case-control
  • Clinical trial
  • Cross Sectional

Frage 32

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British investigators conducted a study to compare measles-mumps-rubella (MMR) vaccine history among 1,294 children with pervasive development disorder (e.g., autism and Asperger's syndrome) and 4,469 children without such disorders. (They found no association.) This is an example of which type(s) of study?
Antworten
  • Cohort
  • Case-control
  • Clinical trial
  • Cross Sectional

Frage 33

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A cohort study differs from a case-control study in that:
Antworten
  • Subjects are enrolled or categorized on the basis of their exposure status in a cohort study but not in a case-control study
  • Subjects are asked about their exposure status in a cohort study but not in a case-control study
  • Cohort studies require many years to conduct, but case-control studies do not
  • Cohort studies are conducted to investigate chronic diseases, case-control studies are used for infectious diseases

Frage 34

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A key feature of a cross-sectional study EXCEPT:
Antworten
  • It usually provides information on prevalence rather than incidence
  • It is limited to health exposures and behaviors rather than health outcomes
  • It is more useful for descriptive epidemiology than it is for analytic epidemiology
  • It is synonymous with survey

Frage 35

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The epidemiologic triad of disease causation refers to
Antworten
  • Agent, host, environment
  • Time, place, person
  • Source, mode of transmission, susceptible host
  • John Snow, Robert Koch, Kenneth Rothman

Frage 36

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For each of the following, identify the appropriate letter from the time line in Figure 1.27 representing the natural history of disease.
Image:
Figure1.27 (binary/octet-stream)
Antworten
  • Onset of symptoms
  • Usual time of diagnosis
  • Exposure
  • Latency Period

Frage 37

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For each of the following, identify the appropriate letter from the time line in Figure 1.27 representing the natural history of disease.
Image:
Figure1.27 (binary/octet-stream)
Antworten
  • Exposure
  • Onset of symptoms
  • Pathologic Changes
  • Usual Time of Diagnosis

Frage 38

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For each of the following, identify the appropriate letter from the time line in Figure 1.27 representing the natural history of disease.
Image:
Figure1.27 (binary/octet-stream)
Antworten
  • Exposure
  • Onset of symptoms
  • Usual Time of Diagnosis
  • Pathologic Changes

Frage 39

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For each of the following, identify the appropriate letter from the time line in Figure 1.27 representing the natural history of disease.
Image:
Figure1.27 (binary/octet-stream)
Antworten
  • Exposure
  • Onset of symptoms
  • Usual Time of Diagnosis
  • Pathologic Changes

Frage 40

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A reservoir of an infectious agent can be:
Antworten
  • An asymptomatic human
  • A symptomatic human
  • An animal
  • The environment
  • All of the above

Frage 41

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Indirect transmission includes which of the following EXCEPT?
Antworten
  • Droplet spread
  • Mosquito-borne
  • Foodborne
  • Doorknobs or toilet seats

Frage 42

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Disease control measures are generally directed at which of the followingEXXCEPT ?
Antworten
  • Eliminating the reservoir
  • Eliminating the vector
  • Eliminating the host
  • Interrupting mode of transmission
  • Reducing host susceptibility

Frage 43

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Disease 1: usually 40–50 cases per week; last week, 48 cases
Antworten
  • Endemic
  • Outbreak
  • Pandemic
  • Sporadic

Frage 44

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Disease 2: fewer than 10 cases per year; last week, 1 case
Antworten
  • Endemic
  • Outbreak
  • Pandemic
  • Sporadic

Frage 45

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Disease 3: usually no more than 2–4 cases per week; last week, 13 cases
Antworten
  • Endemic
  • Outbreak
  • Pandemic
  • Sporadic

Frage 46

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A propagated epidemic is usually the result of what type of exposure?
Antworten
  • Point source
  • Continuous common source
  • Intermittent common source
  • Person-to-person

Frage 47

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Which of the following are frequency measures?
Antworten
  • Birth rate
  • Incidence
  • Mortality rate
  • Prevalence

Frage 48

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In a state that did not require varicella (chickenpox) vaccination, a boarding school experienced a prolonged outbreak of varicella among its students that began in September and continued through December. To calculate the probability or risk of illness among the students, which denominator would you use?
Antworten
  • Number of susceptible students at the ending of the period (i.e., June)
  • Number of susceptible students at the midpoint of the period (late October/early November)
  • Number of susceptible students at the beginning of the period (i.e., September)
  • Average number of susceptible students during outbreak

Frage 49

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All proportions are ratios, but not all ratios are proportions.
Antworten
  • True
  • False

Frage 50

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Many of the students at the boarding school, including 6 just coming down with varicella, went home during the Thanksgiving break. About 2 weeks later, 4 siblings of these 6 students (out of a total of 10 siblings) developed varicella. The secondary attack rate among siblings was, therefore,:
Antworten
  • 4 ⁄ 6
  • 4 ⁄ 10
  • 4 ⁄ 16
  • 6 ⁄ 10

Frage 51

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Investigators enrolled 100 diabetics without eye disease in a cohort (follow-up) study. The results of the first 3 years were as follows: Year 1: 0 cases of eye disease detected out of 92; 8 lost to follow-up Year 2: 2 new cases of eye disease detected out of 80; 2 had died; 10 lost to follow-up Year 3: 3 new cases of eye disease detected out of 63; 2 more had died; 13 more lost to follow-up The person-time incidence rate is calculated as:
Antworten
  • 5 ⁄ 100
  • 5 ⁄ 63
  • 5 ⁄ 235
  • 5 ⁄ 250

Frage 52

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The units for the quantity you calculated in Question 8 could be expressed as:
Antworten
  • cases per 100 persons
  • percent
  • cases per person-year
  • cases per person per year

Frage 53

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Measure of risk
Antworten
  • Incidence
  • Prevalence

Frage 54

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Generally preferred for chronic diseases without clear date of onset
Antworten
  • Incidence
  • Prevalence

Frage 55

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Used in calculation of risk ratio
Antworten
  • Incidence
  • Prevalence

Frage 56

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Affected by duration of illness
Antworten
  • Incidence
  • Prevalence

Frage 57

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Use the following information for Questions 57–61. Within 10 days after attending a June wedding, an outbreak of cyclosporiasis occurred among attendees. Of the 83 guests and wedding party members, 79 were interviewed; 54 of the 79 met the case definition. The following two-by-two table shows consumption of wedding cake (that had raspberry filling) and illness status. Ate wedding cake? Ill Well Total Yes 50 3 53 No 4 22 26 Total 54 25 79 The fraction 54 ⁄ 79 is a/an:
Antworten
  • Food-specific attack rate
  • Attack rate
  • Incidence proportion
  • Proportion

Frage 58

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The fraction 50 ⁄ 54 is a/an:
Antworten
  • Attack rate
  • Food-specific attack rate
  • Incidence proportion
  • Proportion

Frage 59

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The fraction 50 ⁄ 53 is a/an:
Antworten
  • Attack rate
  • Food-specific attack rate
  • Incidence proportion
  • Proportion

Frage 60

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The best measure of association to use for these data is a/an:
Antworten
  • Food-specific attack rate
  • Odds ratio
  • Rate ratio
  • Risk ratio

Frage 61

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The best estimate of the association between wedding cake and illness is:
Antworten
  • 6.1
  • 7.7
  • 68.4
  • 83.7
  • 91.7
  • 94.3

Frage 62

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The attributable proportion for wedding cake is:
Antworten
  • 6.1%
  • 7.7%
  • 68.4%
  • 83.7%
  • 91.7%
  • 94.3%

Frage 63

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Use the following diagram for Questions 63 and 64. Assume that the horizontal lines in the diagram represent duration of illness in 8 different people, out of a community of 700. What is the prevalence of disease during July?
Image:
Question17 (image/gif)
Antworten
  • 3 ⁄ 700
  • 4 ⁄ 700
  • 5 ⁄ 700
  • 8 ⁄ 700

Frage 64

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What is the incidence of disease during July?
Antworten
  • 3 ⁄ 700
  • 4 ⁄ 700
  • 5 ⁄ 700
  • 8 ⁄ 700

Frage 65

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Which of the following mortality rates use the estimated total mid-year population as its denominator?
Antworten
  • Age-specific mortality rate
  • Sex-specific mortality rate
  • Crude mortality rate
  • Cause-specific mortality rate

Frage 66

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Vaccine efficacy measures are:
Antworten
  • The proportion of vaccinees who do not get the disease
  • 1 − the attack rate among vaccinees
  • The proportionate reduction in disease among vaccinees
  • 1 − disease attributable to the vaccine

Frage 67

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To study the causes of an outbreak of aflatoxin poisoning in Africa, investigators conducted a case-control study with 40 case-patients and 80 controls. Among the 40 poisoning victims, 32 reported storing their maize inside rather than outside. Among the 80 controls, 20 stored their maize inside. The resulting odds ratio for the association between inside storage of maize and illness is:
Antworten
  • 3.2
  • 5.2
  • 12.0
  • 33.3

Frage 68

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The crude mortality rate in Community A was higher than the crude mortality rate in Community B, but the age-adjusted mortality rate was higher in Community B than in Community A. This indicates that:
Antworten
  • Investigators made a calculation error
  • No inferences can be made about the comparative age of the populations from these data
  • The population of Community A is, on average, older than that of Community B
  • The population of Community B is, on average, older than that of Community A

Frage 69

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public health surveillance includes which activities EXCEPT?
Antworten
  • Data collection.
  • Data analysis.
  • Data interpretation.
  • Data dissemination.
  • Disease control.

Frage 70

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Current public health surveillance targets which of the following?
Antworten
  • Chronic diseases.
  • Communicable diseases.
  • Health-related behaviors.
  • Occupational hazards.
  • Presence of viruses in mosquitoes.
  • All of the above

Frage 71

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Public health surveillance can be described primarily as which of the following?
Antworten
  • A method to monitor occurrences of public health problems.
  • A program to control disease outbreaks.
  • A system for collecting health-related information.
  • A system for monitoring persons who have been exposed to a communicable disease.

Frage 72

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Public health surveillance is only conducted by public health agencies.
Antworten
  • True
  • False

Frage 73

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Common uses and applications of public health surveillance include which of the following?
Antworten
  • Detecting individual persons with malaria so that they can receive prompt and appropriate treatment.
  • Helping public health officials decide how to allocate their disease control resources.
  • Identifying changes over time in the proportion of children with elevated blood lead levels in a community.
  • Documenting changes in the incidence of varicella (chickenpox), if any, after a law requiring varicella vaccination took effect.
  • All of the above

Frage 74

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Data collected through which of the following methods is NOT commonly used for surveillance?
Antworten
  • Vital registration.
  • Randomized clinical trials.
  • Disease notifications.
  • Population surveys.

Frage 75

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Health-care providers might be important sources of surveillance data used by public health officials, and they should receive feedback to close the surveillance loop as a courtesy; however, the results almost never have any relevance to patient care provided by those health-care providers.
Antworten
  • True
  • False

Frage 76

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Vital statistics are important sources of data on which of the following?
Antworten
  • Morbidity.
  • Mortality.
  • Health-related behaviors.
  • Injury and disability.
  • Outpatient health-care usage.

Frage 77

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Vital statistics provide an archive of certain health data. These data do not become surveillance data until they are analyzed, interpreted, and disseminated with the intent of influencing public health decision-making or action.
Antworten
  • True
  • False

Frage 78

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Key sources of morbidity data include which of the following EXCEPT?
Antworten
  • Environmental monitoring data.
  • Hospital discharge data.
  • Laboratory results.
  • Notifiable disease reports.

Frage 79

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Notifiable disease surveillance usually focuses on morbidity from the diseases on the list and does not cover mortality from those diseases.
Antworten
  • True
  • False

Frage 80

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The list of diseases that a physician must report to the local health department is typically compiled by the…
Antworten
  • Local health department.
  • State health department.
  • Centers for Disease Control and Prevention (CDC).
  • Council of State and Territorial Epidemiologists (CSTE).
  • Medical licensing board.

Frage 81

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A physician working in an emergency room in Town A, USA, has just examined a tourist from Southeast Asia with watery diarrhea. The physician suspects the man might have cholera. The physician should notify the …
Antworten
  • Local (town or county) health agency.
  • State health department.
  • Centers for Disease Control and Prevention (CDC).
  • U.S. Department of State.
  • Washington, D.C., embassy of country of origin (ask for health attaché).

Frage 82

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[blank_start]Notifiable disease surveillance[blank_end] State-based, with subsequent reporting to CDC.
Antworten
  • Notifiable disease surveillance
  • Surveillance for consumer product-relate

Frage 83

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[blank_start]Notifiable disease surveillance[blank_end]Focused on identifying individual cases.
Antworten
  • Notifiable disease surveillance
  • Surveillance for consumer product-relate
  • Both.
  • Neither

Frage 84

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[blank_start]Both[blank_end] Can monitor trends over time.
Antworten
  • Both
  • Notifiable disease surveillance
  • Surveillance for consumer product-relate
  • Neither

Frage 85

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Based on statistically valid sample.
Antworten
  • Notifiable disease surveillance
  • Surveillance for consumer product-related injuries
  • Both.
  • Neither

Frage 86

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Complete, unbiased reporting
Antworten
  • Notifiable disease surveillance
  • Surveillance for consumer product-related injuries
  • Both.
  • Neither.

Frage 87

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Evaluating and improving surveillance should address which of the following EXCEPT?
Antworten
  • Purpose and objectives of surveillance.
  • Resources needed to conduct surveillance.
  • Effectiveness of measures for controlling the disease under surveillance.
  • Presence of characteristics of well-conducted surveillance.

Frage 88

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Criteria for prioritizing health problems for surveillance include which of the following EXCEPT?
Antworten
  • Incidence of the problem.
  • Public concern about the problem.
  • Number of previous studies of the problem.
  • Social and economic impact of the problem.

Frage 89

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Watches for individual cases of disease of public health importance.
Antworten
  • Surveillance based on a specific case definition for a disease (e.g., listeriosis).
  • Syndromic surveillance based on symptoms, signs, or other characteristics of a disease, rather than specific clinical or laboratory diagnostic criteria.
  • Both.
  • Neither

Frage 90

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Watches for diseases that might be caused by acts of biologic or chemical terrorism.
Antworten
  • Surveillance based on a specific case definition for a disease (e.g., listeriosis).
  • Syndromic surveillance based on symptoms, signs, or other characteristics of a disease, rather than specific clinical or laboratory diagnostic criteria.
  • Both.
  • Neither

Frage 91

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Can watch for disease before a patient seeks care from a health-care provider.
Antworten
  • Surveillance based on a specific case definition for a disease (e.g., listeriosis).
  • Syndromic surveillance based on symptoms, signs, or other characteristics of a disease, rather than specific clinical or laboratory diagnostic criteria.
  • Both.
  • Neither

Frage 92

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Requires little effort on the part of the health department.
Antworten
  • Surveillance based on a specific case definition for a disease (e.g., listeriosis).
  • Syndromic surveillance based on symptoms, signs, or other characteristics of a disease, rather than specific clinical or laboratory diagnostic criteria.
  • Both
  • Neither

Frage 93

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Routine analysis of notifiable disease surveillance data at the state health department might NOT include looking at the number of cases of a disease reported this week …
Antworten
  • and during the previous 2–4 weeks.
  • and the number reported during the comparable weeks of the previous 2–5 years.
  • simultaneously by age, race, and sex of the patient.
  • by county.
  • by county, divided by each county's population (i.e., county rates).

Frage 94

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One week, a state health department received substantially more case reports of a disease in one county than had been reported during the previous 2 weeks. No increase was reported in neighboring counties. Possible explanations for this increase include which of the following?
Antworten
  • An outbreak in the county.
  • Batch reports.
  • Duplicate reports.
  • Increase in the county's population.
  • Laboratory error.
  • All of the above

Frage 95

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The primary reason for preparing and distributing periodic surveillance summaries is which of the following?
Antworten
  • Document recent epidemiologic investigations.
  • Provide timely information on disease patterns and trends to those who need to know it.
  • Provide reprints ofMMWR articles, reports, and recommendations.
  • Acknowledge the contributions of those who submitted case reports.

Frage 96

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Surveillance detected 23 of 30 actual cases of a disease.
Antworten
  • Predictive value positive.
  • Sensitivity.
  • Specificity.
  • Validity

Frage 97

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Of 16 statistically significant aberrations (deviations from baseline) detected by syndromic surveillance, only one represented an actual outbreak of disease.
Antworten
  • Predictive value positive.
  • Sensitivity.
  • Specificity.
  • Validity.

Frage 98

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Underreporting is not a problem for detecting outbreaks of notifiable diseases because the proportion of cases reported tends to remain relatively stable over time.
Antworten
  • True
  • False

Frage 99

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Initiating surveillance for a public health problem or adding a disease to the notifiable disease list is justified for which of the following reason?
Antworten
  • If it is a communicable disease with a high case-fatality rate.
  • If the problem is new and systematically collected data are needed to characterize the disease and its impact on the public.
  • If a program at CDC has recommended its addition to better understand national trends and patterns.
  • all of the above

Frage 100

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The case definition used for surveillance of a health problem should be the same as the case definition used for clinical (treatment) purposes.
Antworten
  • True
  • False

Frage 101

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A state health department decides to strengthen its notifiable disease reporting. The one best action to take is to …
Antworten
  • allow reporting through use of the Internet.
  • require more disease-specific forms from local health departments.
  • ensure that all persons with a responsibility to report understand the requirements and reasons for reporting and how reports will be used.
  • reduce the number of diseases on the list.

Frage 102

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Which of the following best describes the similarities and differences in the three distributions shown in Figure 2.11?
Image:
Figure2.11 (image/png)
Antworten
  • Same mean, median, mode; different standard deviation
  • Same mean, median, mode; same standard deviation
  • Different mean, median, mode; different standard deviation
  • Different mean, median, mode; same standard deviation

Frage 103

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Which of the following terms accurately describe the distribution shown in Figure 2.12?
Image:
Figure2.12 (image/png)
Antworten
  • Negatively skewed
  • Positively skewed
  • Symmetrical

Frage 104

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What is the likely relationship between mean, median, and mode of the distribution shown in Figure 2.12?
Antworten
  • Mean < median < mode
  • Mean = median = mode
  • Mean > median > mode
  • Mode < mean and median, but cannot tell relationship between mean and median

Frage 105

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The mode is the value that:
Antworten
  • Is midway between the lowest and highest value
  • Occurs most often
  • Has half the observations below it and half above it
  • Is statistically closest to all of the values in the distribution

Frage 106

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The median is the value that:
Antworten
  • Is midway between the lowest and highest value
  • Occurs most often
  • Has half the observations below it and half above it
  • Is statistically closest to all of the values in the distribution

Frage 107

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Is statistically closest to all of the values in the distribution
Antworten
  • Is midway between the lowest and highest value
  • Occurs most often
  • Has half the observations below it and half above it
  • Is statistically closest to all of the values in the distribution

Frage 108

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The geometric mean is the value that:
Antworten
  • Is midway between the lowest and highest value on a log scale
  • Occurs most often on a log scale
  • Has half the observations below it and half above it on a log scale
  • Is statistically closest to all of the values in the distribution on a log scale

Frage 109

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In epidemiology, the measure of central location generally preferred for summarizing skewed data such as incubation periods is the:
Antworten
  • Mean
  • Median
  • Midrange
  • Mode

Frage 110

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The measure of central location generally preferred for additional statistical analysis is the:
Antworten
  • Mean
  • Median
  • Midrange
  • Mode

Frage 111

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Which of the following is NOT considered measures of spread?
Antworten
  • Interquartile range
  • Percentile
  • Range
  • Standard deviation

Frage 112

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The measure of spread most affected by one extreme value is the:
Antworten
  • Interquartile range
  • Range
  • Standard deviation
  • Mean

Frage 113

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The interquartile range covers what proportion of a distribution?
Antworten
  • 25%
  • 50%
  • 75%
  • 100%

Frage 114

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The measure of central location most commonly used with the interquartile range is the:
Antworten
  • Arithmetic mean
  • Geometric mean
  • Median
  • Midrange
  • Mode

Frage 115

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The measure of central location most commonly used with the standard deviation is the:
Antworten
  • Arithmetic mean
  • Median
  • Midrange
  • Mode

Frage 116

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The algebraic relationship between the variance and standard deviation is that:
Antworten
  • The standard deviation is the square root of the variance
  • The variance is the square root of the standard deviation
  • The standard deviation is the variance divided by the square root of n
  • The variance is the standard deviation divided by the square root of n

Frage 117

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Before calculating a standard deviation, one should ensure that:
Antworten
  • The data are somewhat normally distributed
  • The total number of observations is at least 50
  • The variable is an interval-scale or ratio-scale variable
  • All of the above

Frage 118

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Simply by scanning the values in each distribution below, identify the distribution with the largest standard deviation.
Antworten
  • 1, 10, 15, 18, 20, 20, 22, 25, 30, 39
  • 1, 3, 8, 10, 20, 20, 30, 32, 37, 39
  • 1, 15, 17, 19, 20, 20, 21, 23, 25, 39
  • 41, 42, 43, 44, 45, 45, 46, 47, 48, 49

Frage 119

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Given the area under a normal curve, which two of the following ranges are the same? (Circle the TWO that are the same.)
Antworten
  • From the 2.5th percentile to the 97.5th percentile
  • From the 5th percentile to the 95th percentile
  • From the 25th percentile to the 75th percentile
  • From 1 standard deviation below the mean to 1 standard deviation above the mean
  • None of the above

Frage 120

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The primary use of the standard error of the mean is in calculating the:
Antworten
  • confidence interval
  • error rate
  • standard deviation
  • variance

Frage 121

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Tables and graphs are NOT important tools for which tasks of an epidemiologist?
Antworten
  • Data collection
  • Data summarization (descriptive epidemiology)
  • Data analysis
  • Data presentation

Frage 122

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A table in a report or manuscript should include EXCEPT:
Antworten
  • Title
  • Row and column labels
  • Footnotes that explain abbreviations, symbols, exclusions
  • Source of the data
  • Explanation of the key findings

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The following table is unacceptable because the percentages add up to 99.9% rather than 100.0% Age group No. Percent < 1 year 10 19.6 1–4 9 17.6 5–9 9 17.6 10–14 17 33.3 ≥15 6 11.8 Total 53
Antworten
  • True
  • False

Frage 124

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In the following table, the total number of persons with the disease is: Cases Controls Total Exposed 22 12 34 Unexposed 3 13 16 Total 25 25 50
Antworten
  • 3
  • 22
  • 25
  • 34
  • 50

Frage 125

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A table shell is the:
Antworten
  • Box around the outside of a table
  • Lines ("skeleton") of a table without the labels or title
  • Table with data but without the title, labels or data
  • Table with labels and title but without the data

Frage 126

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The best time to create table shells is:
Antworten
  • Just before planning a study
  • As part of planning the study
  • Just after collecting the data
  • Just before analyzing the data
  • As part of analyzing the data

Frage 127

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Recommended methods for creating categories for continuous variables include:
Antworten
  • Basing the categories on the mean and standard deviation
  • Dividing the data into categories with similar numbers of observations in each
  • Dividing the range into equal class intervals
  • Using categories that have been used in national surveillance summary reports
  • Using the same categories as your population data are grouped
  • All of the above
  • None of the above

Frage 128

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In frequency distributions, observations with missing values should be excluded.
Antworten
  • True
  • False

Frage 129

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The following are reasonable categories for a disease that mostly affects people over age 65 years: Age Group < 65 years 65–70 70–75 75–80 80–85 85
Antworten
  • True
  • False

Frage 130

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In general, before you create a graph to display data, you should put the data into a table.
Antworten
  • True
  • False

Frage 131

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On an arithmetic-scale line graph, the x-axis and y-axis each should:
Antworten
  • Begin at zero on each axis
  • Have labels for the tick marks and each axis
  • Use the same tick mark spacing on the two axes
  • All of the above

Frage 132

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[blank_start]Semilogarithmic-scale line graph[blank_end]A wide range of values can be plotted and seen clearly, regardless of magnitude
Antworten
  • Semilogarithmic-scale line graph
  • Arithmetic-scale line graph
  • Both
  • Neither

Frage 133

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[blank_start]Arithmetic-scale line graph[blank_end]A constant rate of change would be represented by a curved line
Antworten
  • Arithmetic-scale line graph
  • Semilogarithmic-scale line graph
  • Both
  • Neither

Frage 134

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[blank_start]Semilogarithmic-scale line graph[blank_end]The y-axis tick labels could be 0.1, 1, 10, and 100
Antworten
  • Semilogarithmic-scale line graph
  • Arithmetic-scale line graph
  • Both
  • Neither

Frage 135

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[blank_start]Both[blank_end] Can plot numbers or rates
Antworten
  • Both
  • Arithmetic-scale line graph
  • Semilogarithmic-scale line graph
  • Neither

Frage 136

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[blank_start]Bar chart[blank_end]Used for categorical variables on the x-axis
Antworten
  • Bar chart
  • Histogram
  • Both
  • Neither

Frage 137

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[blank_start]Both[blank_end] Columns can be subdivided with color or shading to show subgroups
Antworten
  • Both
  • Bar Chart
  • Histogram
  • Neither

Frage 138

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[blank_start]Histogram[blank_end]Displays continuous data
Antworten
  • Histogram
  • Bar chart
  • Both
  • Neither

Frage 139

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[blank_start]Histogram[blank_end] Epidemic curve
Antworten
  • Histogram
  • Bar Chart
  • Both
  • Neither

Frage 140

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Which of the following shapes of a population pyramid is most consistent with a young population?
Antworten
  • Tall, narrow rectangle
  • Short, wide rectangle
  • Triangle base down
  • Triangle base up

Frage 141

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A frequency polygon differs from a line graph because a frequency polygon:
Antworten
  • Displays a frequency distribution; a line graph plots data points
  • Can show percentages on the y-axis; a line graph cannot
  • Cannot be used to plot data over time
  • All of the above

Frage 142

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Y-axis shows percentages from 0% to 100%
Antworten
  • Cumulative frequency curve
  • Survival curve
  • Both
  • Neither

Frage 143

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Plotted curve usually begins in the upper left corner
Antworten
  • Cumulative frequency curve
  • Survival curve
  • Both
  • Neither

Frage 144

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Plotted curve usually begins in the lower left corner
Antworten
  • Cumulative frequency curve
  • Survival curve
  • Both
  • Neither

Frage 145

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Horizontal line drawn from 50% tick mark to plotted curve intersects at median
Antworten
  • Cumulative frequency curve
  • Survival curve
  • Both
  • Neither

Frage 146

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A scatter diagram is the graph of choice for plotting:
Antworten
  • Anabolic steroid levels measured in both blood and urine among a group of athletes
  • Mean cholesterol levels over time in a population
  • Infant mortality rates by mean annual income among different countries
  • Systolic blood pressure by eye color (brown, blue, green, other) measured in each person

Frage 147

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Which of the following requires more than one variable?
Antworten
  • Frequency distribution
  • One-variable table
  • Pie chart
  • Scatter diagram
  • Simple bar chart

Frage 148

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Compared with a scatter diagram, a dot plot:
Antworten
  • Is another name for the same type of graph
  • Differ because a scatter diagram plots two continuous variables; a dot plot plots one continuous and one categorical variable
  • Differ because a scatter diagram plots one continuous and one categorical variable; a dot plot plots two continuous variables
  • Plots location of cases on a map

Frage 149

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A spot map must reflect numbers; an area map must reflect rates.
Antworten
  • True
  • False

Frage 150

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To display different rates on an area map using different colors, select different colors that have the same intensity, so as not to bias the audience.
Antworten
  • True
  • False

Frage 151

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In an oral presentation, three-dimensional pie charts and three-dimensional columns in bar charts are desirable because they add visual interest to a slide.
Antworten
  • True
  • False

Frage 152

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A 100% component bar chart shows the same data as a stacked bar chart. The key difference is in the units on the x-axis.
Antworten
  • True
  • False

Frage 153

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When creating a bar chart, the decision to use vertical or horizontal bars is usually based on:
Antworten
  • The magnitude of the data being graphed and hence the scale of the axis
  • Whether the data being graphed represent numbers or percentages
  • Whether the creator is an epidemiologist (who almost always use vertical bars)
  • Which looks better, such as whether the label fits below the bar

Frage 154

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[blank_start]Grouped bar chart[blank_end] Number of cases of dog bites by age group (adult or child) and sex of the victim
Antworten
  • Grouped bar chart
  • Histogram
  • Line graph
  • Pie chart

Frage 155

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[blank_start]Pie chart[blank_end]Number of cases of dog bites by breed of the dog
Antworten
  • Pie chart
  • Grouped bar chart
  • Histogram
  • Line graph

Frage 156

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[blank_start]Line graph[blank_end]Number of cases of dog bites per 100,000 population over time
Antworten
  • Line graph
  • Grouped bar chart
  • Histogram
  • Pie Chart

Frage 157

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Number of cases of dog bites over time
Antworten
  • Grouped bar chart
  • Histogram
  • Line graph
  • Pie chart

Frage 158

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Which are the most common ways that a local health department uncovers outbreaks?
Antworten
  • Performing descriptive analysis of surveillance data each week
  • Performing time series analysis to detect deviations from expected values based on the previous few weeks and comparable periods during the previous few years
  • Receiving calls from affected residents
  • Receiving calls from healthcare providers
  • Reviewing all case reports received each week to detect common features

Frage 159

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Factors that influence a health department's decision whether or not to conduct a field investigation in response to one or more cases of disease include
Antworten
  • The nature of the disease
  • The number of cases
  • Resources available
  • Health department's traditional attitude toward conducting field investigations
  • All of the above

Frage 160

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If a particular outbreak presents an unusual opportunity to learn more about the disease and its epidemiology by conducting a study, but early disease control measures would interfere with the study, one should conduct the study quickly, then implement control measures immediately afterwards.
Antworten
  • True
  • False

Frage 161

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Outbreak with known causative agent, source, and mode of transmission
Antworten
  • Disease control and prevention efforts take priority over investigation efforts
  • Investigation efforts take priority over disease control and prevention efforts

Frage 162

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Outbreak with known causative agent, but unknown source and mode of transmission
Antworten
  • Disease control and prevention efforts take priority over investigation efforts Investigation efforts take priority over disease control and prevention efforts
  • If the agent is known but the source and mode of transmission are not known (example: Salmonella eventually traced to marijuana), then the health department does not know how to target its intervention. Investigation to learn the source and/or mode is necessary.

Frage 163

Frage
Outbreak with unknown causative agent, source, and mode of transmission
Antworten
  • Disease control and prevention efforts take priority over investigation efforts
  • Investigation efforts take priority over disease control and prevention efforts

Frage 164

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Use the following steps of an outbreak investigation for Question 5: 1. Analyze data by time, place, and person 2. Conduct a case-control study 3. Generate hypotheses 4. Conduct active surveillance for additional cases 5. Verify the diagnosis 6. Confirm that the number of cases exceeds the expected number 7. Talk with laboratorians about specimen collection For an investigation of an outbreak, what is the logical conceptual order of the steps listed above?
Antworten
  • 1-2-3-4-5-6-7
  • 5-6-4-1-2-3-7
  • 6-5-3-1-2-7-4
  • 6-5-7-4-1-3-2

Frage 165

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To avoid skipping a critical step, investigators should conduct the steps of an outbreak investigation in the precise order you answered in Question 164.
Antworten
  • True
  • False

Frage 166

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200 cases of Marburg virus infection in several districts in Angola over several months (usually none)
Antworten
  • Cluster
  • Epidemic
  • Outbreak

Frage 167

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40 cases ofSalmonella Enteritidis in 1 week traced to a single meal served at a cafeteria (usually none)
Antworten
  • Cluster
  • Epidemic
  • Outbreak

Frage 168

Frage
10 cases of cancer diagnosed over 2 years among residents of a single neighborhood (previous data not available)
Antworten
  • Cluster
  • Epidemic
  • Outbreak

Frage 169

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Why should an investigator who has no clinical background nonetheless talk to a patient or two as an early step in the outbreak investigation?
Antworten
  • To advise the patient about common risk factors and the usual course of the illness, after reviewing such information in appropriate reference material
  • To develop hypotheses about the cause of the outbreak
  • To learn more about the clinical manifestations of the disease
  • To verify the clinical findings as part of verifying the diagnosis
  • To verify the laboratory findings as part of verifying the diagnosis

Frage 170

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A case definition during an outbreak investigation should NOT specify:
Antworten
  • Clinical features
  • Time
  • Place
  • Person
  • Hypothesized exposure

Frage 171

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Ideally, a case definition is 100% accurate in identifying who does and does not have the disease in question, but in reality few case definitions achieve this ideal.
Antworten
  • True
  • False

Frage 172

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Once a case definition for an outbreak investigation has been established, it should not be changed.
Antworten
  • True
  • False

Frage 173

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Common methods of identifying additional cases (expanding surveillance) as part of an outbreak investigation include:
Antworten
  • Advising the public through newspapers, TV, radio, and the health department's website to contact the local health department
  • Asking case-patients who they were with at the time of exposure (if known)
  • Sending a fax to healthcare providers
  • Telephoning the infection control practitioners at local hospitals
  • All of the above
  • None of the above

Frage 174

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A case report form devised for an outbreak investigation usually includes which of the following types of information?
Antworten
  • Identifying information
  • Demographic information
  • Clinical information
  • Risk factor information
  • Reporter, interviewer, or data abstractor information
  • All of the above
  • None of the above

Frage 175

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Descriptive epidemiology is essential for "characterizing the outbreak" by time, place, and person, but has little bearing on the analytic epidemiology.
Antworten
  • True
  • False

Frage 176

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A malfunctioning space heater was used each time the outside temperature dropped below freezing
Antworten

Frage 177

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At the Eclipse Restaurant, sodium nitrite was mistaken for table salt in the preparation of breakfast one morning only
Antworten

Frage 178

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Common cold passed from classmate to classmate
Antworten

Frage 179

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A group of tourists on a weeklong bus tour of a European country experienced an outbreak of norovirus. The group had followed a consistent meal time pattern: each morning they had breakfast together in whichever hotel they had stayed from 6:00 a.m. to 7:00 a.m., stopped for lunch from 1:00 p.m. to 2:00 p.m., then had dinner together either at the next hotel or at a restaurant at about 7:00 p.m. The incubation period for norovirus is about 24-48 hours, with a median of about 33 hours. On which day and at which meal was exposure most likely?
Image:
Quiz16 (image/jpeg)
Antworten
  • April 19 Dinner
  • April 20 Breakfast
  • April 20 Lunch
  • April 20 Dinner
  • April 21 Breakfast

Frage 180

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Possible explanations for a case that occurs substantially later than the other cases in an outbreak include:
Antworten
  • Similar but unrelated disease
  • Secondary case
  • Case with unusually long incubation period
  • Time of exposure later than others
  • Error in recording date
  • All of the above
  • None of the above

Frage 181

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A spot map is particularly useful for displaying:
Antworten
  • Geographic location of exposure of each case-patient
  • Residence of each case-patient
  • Incidence rate of disease by area
  • Prevalence rate of disease by area

Frage 182

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Which of the following may be useful in generating hypotheses in an outbreak setting?
Antworten
  • Review the literature
  • Look at the descriptive epidemiology
  • Look at the outliers
  • Talk with the local health authorities
  • Talk with a few of the case-patients
  • Talk with subject matter experts
  • All of the above
  • None of the above

Frage 183

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The key feature of an analytic (epidemiologic) study is
Antworten
  • Analysis by time, place, and person
  • Calculation of a risk ratio or odds ratio
  • Use of Epi Info to analyze the data
  • Presence of a comparison group

Frage 184

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Disease control measures can be directed at the:
Antworten
  • Agent
  • Source
  • Mode of transmission
  • Portal of entry
  • Host susceptibility
  • All of the above
  • None of the above

Frage 185

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Use the information in the following paragraph and data in the table for Questions 185–188. An outbreak of gastrointestinal disease occurred 24-36 hours after people had attended a wedding. Of the 203 attendees (including the bride and groom), 200 completed questionnaires, and 50 reported illness compatible with the case definition. Tabulated food consumption histories are presented in the table below. Ate Specified Food Did Not Eat Specified Food Food Item Ill Well Total Ill Well Total Punch 46 (25%) 138 184 4 (25%) 12 16 Wedding Cake 45 (45%) 55 100 5 (5%) 95 100 Sushi 10 (91%) 1 11 40 (21%) 149 189 What is the following study?
Antworten
  • Case Control
  • Cohort
  • Cross Sectional
  • Randomized Control Trial

Frage 186

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The most appropriate measure of association for these data is the:
Antworten
  • Attributable risk percent
  • Chi-square
  • Odds ratio
  • Risk ratio

Frage 187

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Which food is the most likely culprit?
Antworten
  • Punch
  • Wedding cake
  • Sushi
  • Can't determine from the data presented.
  • Must be more than one food.

Frage 188

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Results of this outbreak investigation should be communicated to EXEPT:
Antworten
  • The caterer
  • Local officials
  • Wedding party family and attendees
  • World Health Organization
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