In 1957 a study was conducted in which persons employed in a target tobacco comp

Question

In 1957 a study was conducted in which persons employed in a target tobacco company during the previous 4 years were followed up to the end of 1956 to assess their mortality. It was found that the death rates from all causes, from all cancers (except lung cancer), and from cardiovascular disease were lower than, and lung cancer rates were equal to. those in the corresponding age sex-race groups of the general U.S. population. Noting a previous survey that Showed that these employees contained a higher proportion of both cigarette smokers and heavy cigarette smokers than did the general U.S. population the authors concluded that "the existence of such a population (the employees] makes it evident that cigarette smoking per se is not necessarily or Invariably associated with a higher risk of lung cancer or cardiovascular disease or with diminished longevity What type of study does this represent? A prospective cohort study B retrospective cohort study C retrospective case-control study D prospective cross-sectional study

Explanation / Answer

Answer (A) Prospective Cohort Study .

Reason a prospective cohort study is a longitudinal cohort study that follows over time a group of similar individuals (cohorts) who differ with respect to certain factors under study , to determine how these factors affect rates of a certain outcome.

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