Specificity — FRCA Primary MCQ

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ModerateStatisticsSpecificityFRCA Primary

A residual block test is negative in 760 of 800 patients without residual block. What is the most appropriate value or measurement?

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Correct answer: A — 95%

Specificity is true negatives divided by all unaffected patients. A plausible range for the true population effect 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. Negative predictive value increases 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. 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