Berkson's bias is a type of selection bias unique to which study design?

• A Prospective cohort studies
• B Community-based cross-sectional surveys
• C Randomized controlled trials
• D Hospital-based case-control studies ✓

Explanation

Berkson's bias occurs in hospital-based case-control studies because hospitalized controls differ from the general population — they carry their own disease burden, artificially distorting the exposure-disease association. Using population-based controls avoids this bias. It arises because differential hospitalization rates for cases and controls create a spurious association between the exposure and the disease under study.

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

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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