The higher the prevalence of an injury,the __________ the effect on positive predictive value and the _______ the effect on negative predictive value.
A) higher; higher
B) lower; lower
C) higher; lower
D) lower; higher

Question

Quizplus · Accepted Answer

When the prevalence of an injury increases, the true positive cases increase (which is good for the positive predictive value), but the false negative cases also decrease (which is bad for the negative predictive value). Therefore, the positive predictive value increases, but the negative predictive value decreases. This is consistent with Choice C.

The Higher the Prevalence of an Injury,the __________ the Effect