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Review Question - QID 460

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QID 460 (Type "460" in App Search)
What is the equation for determining specificity of a clinical test?

True negatives divided by the sum of the true negatives and false positives

62%

828/1330

True negatives divided by the sum of the true negatives and false negatives

13%

167/1330

True positives divided by the sum of the true negatives and false positives

5%

61/1330

True positives divided by the sum of the true positives and false negatives

12%

156/1330

True positives divided by the sum of the true positives and false positives

8%

110/1330

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Specificity is the probability that a test result will be negative in patients without disease (answer 1). The sensitivity is the probability that a test result will be positive in patients with disease (answer 4). The positive predictive value is the number of patients with a positive test result who are correctly diagnosed and the negative predictive value is the opposite of this (answers 5 and 2, respectively). The referenced review article by Kocher describes many of the statistical tools useful for practicing orthopaedic surgeons.

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