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Positive likelihood ratio — FRCA Primary MCQ

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HardStatisticsPositive likelihood ratioFRCA Primary

A difficult airway test has a positive likelihood ratio of 10. What is the most appropriate value or measurement?

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Correct answer: D — Positive likelihood ratio substantially increases post-test probability

A positive likelihood ratio of 10 substantially increases post-test probability. 7 is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. 95% is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. 90% is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Area under the ROC curve 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