Which ONE of the following statements about diagnostic tests is INCORRECT?

A. The PPV is the proportion of patients with positive test results who are correctly diagnosed.

B. The NPV is the proportion of patients with negative test results who are correctly diagnosed.

C. Positive (and negative) predictive values depend on the prevalence of disease.

D. Both sensitivity and specificity are conditional on having or not having the disease. They are properties of the test, not the disease.

E. Both PPV and NPV are conditional on having or not having the disease.