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Negative Predictive Value Quiz

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Questions and Answers

What is the formula for calculating the negative predictive value (NPV)?

NPV = TN + FN
NPV = TP + FN
NPV = TP / (TP + FN)
NPV = TN / (TN + FN) (correct)

In the given population, if True Negatives (TN) are 4,503 and False Negatives (FN) are 1,376, what is the negative predictive value?

81.5% (correct)
79.0%
70.9%
76.6%

If a new population has 3,000 True Negatives and 800 False Negatives, what would be the negative predictive value in this new population?

79.4% (correct)
78.1%
72.5%
78.9%

If a diagnostic test has a sensitivity of 84% and a specificity of 77%, what could be the range for the negative predictive value of the test?

70-80% (D) Signup and view all the answers

What does the negative predictive value of a test tell us?

How likely it is that a person who tests negative is truly negative (B) Signup and view all the answers

What proportion does the negative predictive value of a test indicate?

Proportion of truly healthy people who will test negative (C) Signup and view all the answers

What is the appropriate value of X in the prevalence table for hearing loss in people 70+?

Not enough information (C) Signup and view all the answers

What value belongs in box A for a survey with a sensitivity of 68% to detect moderate hearing loss?

$32%$ (D) Signup and view all the answers

What is the formula for negative predictive value (NPV)?

NPV = True negatives / (True negatives + False negatives) (A) Signup and view all the answers

Why is a low negative predictive value problematic for a screening tool?

It may give false reassurance to individuals who actually have the disease. (C) Signup and view all the answers

In the given data, what is the total number of false negatives?

4,503 (C) Signup and view all the answers

If the number of true negatives is 4,503, what is the negative predictive value for the screening tool?

74.8% (A) Signup and view all the answers

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