Neyman bias (prevalence-incidence bias) occurs in which type of study?
- A Cross-sectional study ✓
- B Case-control study
- C Randomized controlled trial
- D Cohort study
Correct answer: A. Cross-sectional study
Explanation
Neyman (prevalence-incidence) bias occurs in cross-sectional studies because only prevalent cases (survivors) are measured at one time point; rapidly fatal or self-resolving cases are missed. This can lead to underestimation of exposure-disease associations if exposure affects survival or recovery.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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