In a survival analysis, a patient who withdraws from the study before the event occurs is described as:
- A Lost to follow-up event
- B Non-compliant subject
- C Censored observation ✓
- D Competing risk event
Correct answer: C. Censored observation
Explanation
Censoring in survival analysis refers to incomplete follow-up where the time to event is not fully observed — this occurs when patients withdraw, are lost to follow-up, or the study ends before the event occurs. Censored observations contribute their partial follow-up time to the analysis. A competing risk is a different event that prevents the primary event from occurring.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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