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Positive predictive value — FRCA Primary MCQ

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EasyStatisticsPositive predictive valueFRCA Primary

In a high-risk clinic, 80 true positive and 20 false positive tests occur. What is the most appropriate value or measurement?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — 80%

PPV is true positives divided by all positive tests. Type I error is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. 7 is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Type II error from inadequate power is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Positive likelihood ratio substantially increases post-test probability is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA statistics, distinguish the question being asked from related but different measures of association or diagnostic accuracy.

Reference: RCoA Primary FRCA syllabus; Bland Medical Statistics; Primary FRCA textbooks