Table 1. Duration of trachoma infection and disease, and sensitivity and specificity of laboratory tests and clinical diagnoses (with approximate 95% confidence intervals).

	Sensitivity (%)	Specificity (%)	Age (years)	Median duration (weeks)	Hazard of infection/disease (per year)
Disease	97 (95–98)	93 (90–95)
			0–4	36.1 (17.7–73.5)	1.4 (0.73–2.6)
			5–14	18.8 (11.5–30.7)	0.68 (0.38–1.2)
			15+	7.0 (2.6–19.2)	0.35 (0.15–0.83)
Infection	77 (70–82)	94 (92–96)
			0–4	15.4 (8.3–28.6)	1.3 (0.6–2.6)
			5–14	8.2 (5.3–12.6)	0.58 (0.24–1.4)
			15+	7.6 (2.2–26.9)	0.072 (0.0036–1.4)