Which study design is most appropriate to estimate relative risk?

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Multiple Choice

Which study design is most appropriate to estimate relative risk?

Explanation:
Estimating risk directly requires observing how often an outcome occurs in people exposed to a factor versus those not exposed over time. A cohort study does just that: it follows exposed and unexposed groups prospectively, records new cases, and allows calculation of incidence in each group. From those incidences you can compute the risk ratio (relative risk) = incidence in exposed divided by incidence in unexposed. Other designs don’t provide direct incidence data. Case-control studies start with cases and controls and look back for exposure, yielding an odds ratio rather than a risk ratio, and they don’t give incidence in the groups. Cross-sectional studies capture exposure and outcome at a single point in time, so they measure prevalence, not incidence, making risk ratios inappropriate. Ecological studies use aggregate data and link population-level measures, which cannot estimate individual-level relative risk and are prone to ecological bias. So the cohort design is best suited for estimating relative risk because it directly measures incidence in defined exposure groups over time.

Estimating risk directly requires observing how often an outcome occurs in people exposed to a factor versus those not exposed over time. A cohort study does just that: it follows exposed and unexposed groups prospectively, records new cases, and allows calculation of incidence in each group. From those incidences you can compute the risk ratio (relative risk) = incidence in exposed divided by incidence in unexposed.

Other designs don’t provide direct incidence data. Case-control studies start with cases and controls and look back for exposure, yielding an odds ratio rather than a risk ratio, and they don’t give incidence in the groups. Cross-sectional studies capture exposure and outcome at a single point in time, so they measure prevalence, not incidence, making risk ratios inappropriate. Ecological studies use aggregate data and link population-level measures, which cannot estimate individual-level relative risk and are prone to ecological bias.

So the cohort design is best suited for estimating relative risk because it directly measures incidence in defined exposure groups over time.

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