A researcher conducting a case-control study on oral cancer finds that cases are more likely to recall and report previous tobacco use than controls. This introduces which type of bias?
- A Berkson's bias
- B Recall bias ✓
- C Lead-time bias
- D Neyman bias
Correct answer: B. Recall bias
Explanation
Recall bias occurs when cases, aware of their disease, more carefully and completely remember past exposures than healthy controls, leading to differential misclassification of exposure. Berkson's bias is hospital admission bias; lead-time bias inflates apparent survival in screening; Neyman bias occurs when data is collected from survivors only.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.