TABLE 1.

Information about prevalence of the diseases, and sensitivity and false-positive rate of the tests.

Diagnostic task	Base rate	Sensitivity	False-positive rate	Positive predictive value
Breast cancer	100 of 10,000	80 of 100	990 of 9,900	80 of 1,070
Colon cancer	30 of 10,000	15 of 30	299 of 9,970	15 of 314
Diabetes	50 of 10,000	48 of 50	4,975 of 9,950	48 of 5,023

Note that the false-positive rate is the complement of the specificity.