Diagnostic test, screening test and selection bias adjustments for STD measured at basline in Rakai (Rk), Masaka (Mk), and Mwanza (Mw)
| Diagnostic test adjustment | Screening test adjustment | ||||
|---|---|---|---|---|---|
| Se (range) | Sp (range) | Se′ | pscreen | Selection bias adjustment | |
| Observed prevalence adjusted according to equation 1 if no screening test used, according to equation 2 when screening test used. For selection bias adjustments see text for details. M = male, F = female, NG = gonorrhoea, CT = Chlamydia, TV = trichomoniasis, HSV-2 = herpes simplex virus type 2, Se = sensitivity, Sp = specificity, Se′ = sensitivity of screening test, pscreen = prevalence of positive screening test, na = not applicable. | |||||
| Rk, CT | F: 86.6 (75–98.4) | F: 100 (na) | na | na | na |
| M: 87.5 (75–100) | M: 100 (na) | ||||
| Rk, NG | F: 83.8 (50–94.7) | F: 100 (na) | na | na | na |
| M: 88.9 (na) | M: 100 (na) | ||||
| Rk, TV | F: 79.0 (69.7–88.3) | F: 100 (na) | na | na | na |
| Rk, HSV-2 | 92 (na) | 100 (na) | na | na | % sexually active |
| 15–19 years F: 0.71 | |||||
| 20–24 years F: 0.99 | |||||
| 25–29 years F: 1 | |||||
| 15–19 years M: 0.52 | |||||
| 20–24 years M: 0.94 | |||||
| 25–29 years M: 1 | |||||
| Mk, CT | F: 86.6 (75–98.4) | F: 100 (na) | na | na | na |
| M: 87.5 (75–100) | M: 100 (na) | ||||
| Mk, NG | F: 83.8 (50–94.7) | F: 100 (na) | na | na | na |
| M: 88.9 (na) | M: 100 (na) | ||||
| Mk, HSV-2 | 91 (na) | 93 (na) | na | na | |
| Mw, CT | F: 48.8 (22.2–65) | F: 100 (na) | F: na | F: na | na |
| M: 70.3 (58–82.6) | M: 100 (na) | M: 53.3 | M: 0.25 | ||
| Mw, NG | F: 74.2 (50–96.4) | F: 99.8 (98.9–100) | F: na | F: na | na |
| M: 83.3 (na) | M: 100 (na) | M: 87.5 | M: 0.25 | ||
| Mw, TV | F: 60.9 (36.4–85.3) | F: 99.8 (99.5–100) | na | na | |
| Mw, HSV-2 | 91 (na) | 93 (na) | na | n6 | |