Prospective cohort study

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A prospective cohort study is a research effort that follows over time groups of individuals who are similar in some respects (e.g., all are working adults) but differ on certain other characteristics (e.g., some smoke and others do not) and compares them for a particular outcome (e.g., lung cancer).[1] It should be emphasized that prospective studies begin with a sample whose members are free of the disease or disorder under study (e.g., free of lung cancer or free of major depression). Given the individual differences that exist in a sample (e.g, some people smoke, others do not), all the individuals in the sample are followed over time. The incidence rates for the disease under study are ascertained in key subgroups. For example, in a sample that was free of lung cancer at the outset of the study, after 20 years, one may anticipate that the nonsmokers have the lowest 20-year incidence rate of the disease, moderate smokers, the next highest rate, and the heavy smokers, the highest rate. The prospective study is important for research on the etiology of diseases and disorders in humans because for ethical reasons people cannot be deliberately exposed to suspected risk factors in controlled experiments.

It can be more expensive than a case–control study.[2]

## References

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1. ↑ "Definition of prospective cohort study - NCI Dictionary of Cancer Terms".
2. ↑ Manolio TA, Bailey-Wilson JE, Collins FS (2006). "Genes, environment and the value of prospective cohort studies". Nat. Rev. Genet. 7 (10): 812–20. doi:10.1038/nrg1919. PMID 16983377. Unknown parameter `|month=` ignored (help)CS1 maint: Multiple names: authors list (link)

This article incorporates public domain material from the U.S. National Cancer Institute document "Dictionary of Cancer Terms".

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