Table 5.

Effect of blood on sensitivity and specificity estimates (plus 95% confidence intervals) in a subset of South African samples

Test	Measure	Blood-stained sample
		Yes	No
Chlamydia	Sensitivity	94.4% (84.6–98.9)	85.63 (81.5–89.2)
	Specificity	96.6% (89.6–99.2)	97.56 (96.2–98.5)
Gonorrhoea	Sensitivity	100% (84.6–100)	89.04 (82.8–93.6)
	Specificity	96.4% (91.1–99.0)	99.18 (98.4–99.6)
Trichomoniasis	Sensitivity	71.4% (51.3–86.8)	63.57 (57.5–69.3)
	Specificity	96.5% (91.3–99.0)	99.22 (98.4–99.7)