In a case-control study on cervical cancer, 60 of 100 cases and 30 of 100 controls were exposed to HPV. The Odds Ratio is:
- A 2.0
- B 3.0
- C 3.5 ✓
- D 6.0
Correct answer: C. 3.5
Explanation
In the 2×2 table: a=60 (exposed cases), b=40 (unexposed cases), c=30 (exposed controls), d=70 (unexposed controls). OR = (a×d)/(b×c) = (60×70)/(40×30) = 4200/1200 = 3.5. The odds ratio approximates relative risk when disease prevalence is low, and here indicates that HPV-exposed women have 3.5 times the odds of developing cervical cancer compared to unexposed women.
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.