Two pathologists independently examine 100 cervical biopsies. They agree on 85 specimens. The expected agreement by chance alone is 50%. The kappa statistic for inter-rater agreement is:
- A 0.35
- B 0.50
- C 0.70 ✓
- D 0.85
Correct answer: C. 0.70
Explanation
Kappa equals (Observed agreement minus Expected agreement) divided by (1 minus Expected agreement). Observed agreement is 0.85, expected is 0.50. Kappa equals (0.85 minus 0.50) divided by (1 minus 0.50), which is 0.35 divided by 0.50, giving 0.70. Kappa above 0.60 indicates substantial agreement beyond chance.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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