TABLE 1

Results of prospective sample testing at each laboratory site

SiteNo. of samples that were:Total% (95% CI)
True positiveFalse positiveTrue negativeFalse negativeSensitivitySpecificityTotal agreement
A739263635192.4 (84.4–96.5)96.7 (93.8–98.3)95.7 (91.1–99.4)
B6219318140098.4 (91.5–99.7)94.4 (91.4–96.4)95.0 (91.1–98.0)
C1189314144299.2 (95.4–99.9)97.2 (94.8–98.5)97.7 (93.3–101.4)
Total2533789581,19396.9 (94.1–98.4)96.0 (94.6–97.1)96.2 (93.8–98.3)