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Mother and Child Health: Research Methods G.J.Ebrahim Editor Journal of Tropical Pediatrics, Oxford University Press.
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Criteria to be fulfilled in Cohort Studies Observation must take place over a meaningful period of time All members of the cohort must be observed. Drop-outs distort the study.
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Types of Cohort Past PresentFuture Concurrent Cohort Assembled now Followed into future Historical Cohort Assembled from past records Followed till now Retrospective Cohort Exposure and outcome
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Advantages and Disadvantages of Cohort Studies Direct calculation of incidence Time sequence can be established Different outcomes for one agent can be determined Large numbers to be measured over a long time Subclinical disease may escape diagnosis Advantages Disadvantages
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Analysis of Cohort Studies Exposed Time Diseased (n=39) Healthy Not exposed Diseased (n=6) Healthy n = 30 000 n = 60 000
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