The formula for Relative Risk (RR) in a cohort study is:

• A Odds of exposure in cases / Odds of exposure in controls
• B Prevalence in exposed / Prevalence in unexposed
• C (Incidence in exposed − Incidence in unexposed) / Incidence in exposed
• D Incidence in exposed / Incidence in unexposed ✓

Explanation

Relative Risk (Risk Ratio) = Incidence of outcome in exposed group / Incidence of outcome in unexposed group. RR = 1 means no association; RR >1 indicates increased risk with exposure; RR <1 indicates protective effect. Formula B describes Odds Ratio (used in case-control studies); formula D is Attributable Risk Percent in the exposed.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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