The study design for the brief description below is: Investigators studying bus

Question

The study design for the brief description below is: Investigators studying bus company employees want to test the hypothesis that occupational stress is associated with high blood pressure. Two groups of employees are compared: bus drivers and office workers (in the bus companies) in the same salary range as bus drivers matched on age, sex, race, and length of employment. The investigators take blood pressure measurements of all study subjects and find that the mean blood pressure of bus drivers is higher than that of office workers. A. Randomized trial B. Non-randomized trial C. Cohort study D. Case-Control study E. Cross-Sectional study F. Ecological study

Explanation / Answer

The answer is (c) Cohort studies

cohort study compares groups of individuals who are alike in many ways but differ by a certain characteristic in terms of a particular outcom. Data on the relevant events for each individual are collected from existing records and can immediately be analyzed to determine the relative risk of the cohort compared to the control group.

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