Table 1. Performance of the cholera rapid diagnostic test, Pemba and Unguja, Zanzibar.

	Sensitivity% (95%CI*) (TP/(TP+FN))	Specificity% (95%CI*) (TN/(TN+FP))	PPV% (95%CI*) (TP/(TP+FP))	NPV% (95%CI*) (TN/(TN+FN))	No. pos./total (%) with V. cholera isolated on stool culture
Total (n = 622)	93.1 (88.7–96.2) (189/203)	49.2 (44.3–54.1) (206/419)	47.0 (42.1–52.0) (189/402)	93.6 (89.6–96.5) (206/220)	203/622 (32.6)
Unguja (n = 79)	89.1 (76.4–96.4) (41/46)	51.5 (33.5–69.2) (17/33)	71.9 (58.5–83.0) (41/57)	77.3 (54.6–92.2) (17/22)	46/79 (58.2)
Pemba (n = 543)	94.3 (89.4–97.4) (148/157)	49.0 (43.9–54.1) (189/386)	42.9 (37.6–48.3) (148/345)	95.5 (91.5–97.9) (189/198)	157/543 (28.9)
p	0.82	0.87	0.02	0.53	<0.01

^*using exact method.