A study screening 1000 individuals for diabetes finds 100 true positives, 50 false positives, 820 true negatives, and 30 false negatives. Calculate the Positive Predictive Value (PPV).
- A 66.7%
- B 76.9% ✓
- C 96.5%
- D 89.1%
Correct answer: B. 76.9%
Explanation
PPV = True Positives / (True Positives + False Positives) = 100 / (100 + 50) = 100/130 = 76.9%. PPV represents the probability that a person with a positive test truly has the disease. Sensitivity = 100/(100+30) = 76.9%, Specificity = 820/(820+50) = 94.3%.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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