The long island breast cancer study tested the hypothesis that environmental pollution was causing the relatively high rates of breast cancer among residents of suffolk and nassau counties of new york. epidemiologists identified a group of 1,420 women who were diagnosed with breast cancer between 1984 and 1986 and compared their residential histories over a 20 year period with those of a matched group of healthy women. what kind of epidemiologic study was this? a) cohortb) interventionc) case-controld) prospective

Case Control Study

Explanation:

Case Control is a study comparing patients with a disease or outcome of interest (cases) with patients without the disease or outcome (controls) and looking back prospectively to compare how often the risk factor exposure is present in each group to determine the relationship between the risk factor and the disease.

Case control studies are performed because there is no effort to interfere and no attempt is made to change the disease path.

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