Investigators wishing to study the association between an occupational exposure

Question

Investigators wishing to study the association between an occupational exposure and a relatively rare disease are granted access to the employment records of several major factories, from which the exposures of workers over the last fifty years can be documented. They are also granted access to union records, including health care records, documenting the occurrence of each case of the disease of interest in anyone who has worked in those factories. The researchers study employees at these factories in the 1970's, and divide them into those with a high level of exposure and those with a moderate or low level of exposure. They then compare the cumulative incidences of the disease between these two groups. Their study was

a.         a cross-sectional study

b.         a retrospective cohort study

c.          a cohort study

d.         a case-control study

e.         an ecologic study

Explanation / Answer

B) a retrospective cohort study

Retrospective cohort study is where data is collected that is relevant to the event and is considered on a time based factor with the subsequent occurrence and is systematically collected with events that are already present and not about only a specific period of time.

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