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3. COHORT & CASE CONTROL

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EPIDEMIOLOGY Mind Map on 3. COHORT & CASE CONTROL, created by cristian velez on 18/03/2014.
cristian velez
Mind Map by cristian velez, updated more than 1 year ago
cristian velez
Created by cristian velez almost 11 years ago
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3. COHORT & CASE CONTROL
  1. COHORT STUDIES
    1. cohort: group of persons sharing a common characteristic (geogr, occup, sex, race,etc).
      1. 1. SOURCE POPULATION:se sacan entire or random sample, se descartan enfermos YA con outcome (exposure always preceed outcome) but sometimes disease IS the exposure y se evaluan muertes
        1. 2.FOLLOW OVER TIME for new events, calculating eg. risk v rate
          1. useful for studying uncommon or rare exposures
      2. measure incident cases -- can be PROSPECTIVE OR RETROSP., OPEN or CLOSE
      3. CASE CONTROL STUDIES
        1. for studying rare diseases(<10%). Is INDUCTIVE (from effect to cause, RETROSPECTIVE)--can really MIRROR a cohort
          1. 1. Define&select CASES (sick people)
            1. 2. Define&select CONTROLS (nonsick): restricted source population from which cases arise
              1. MATCHING: for every case, one control has the same variable--should be only STRONG factors
              2. 3. Measure&compare EXPOSURE PREVALENCE
                1. CANNOT use rate&risk, ONLY ODDS (the control is not representative of the population
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