Input parameters and fitted values for sexual behaviour, treatment of sexually transmitted infections (STIs) and commercial sex in the Four Cities Study
| Cotonou | Yaoundé | Kisumu | Ndola | |||||
|---|---|---|---|---|---|---|---|---|
| Cot, Cotonou; F, female; M, male; Kis, Kisumu;; Nd, Ndola; ST, syndromic treatment; Ya, Yaoundé. | ||||||||
| *% cured = % symptomatic × % seeking treatment × treatment efficacy. | ||||||||
| †The frequency at which males visit CSWs is divided into three classes. | ||||||||
| ‡The proportion of clients in each visiting class for married and single males, respectively. | ||||||||
| Model inputs | ||||||||
| General population | ||||||||
| Partner change | Lowest | Highest | >Cot, <Nd | <Ya, >Kis | ||||
| Change in partner change rate over time | No | Increase in 1993 | No | No | ||||
| Age of debut (years) | M: 18, F: 18 | M: 17, F: 17 | M: 17, F: 15 | M: 17, F: 15 | ||||
| Condom use in non-marital partnerships | 10% in 1990 | 10% in 1990 | 10% in 1990 | 10% in 1990 | ||||
| 20% in 1995 | 20% in 1995 | 25% in 1995 | 25% in 1995 | |||||
| Default ST (cured (%))* | M | F | M | F | M | F | M | F |
| NG | 2.7 | 0.6 | 2.7 | 0.6 | 2.7 | 0.6 | 2.7 | 0.6 |
| CT | 0.7 | 0.3 | 0.7 | 0.3 | 0.7 | 0.3 | 0.7 | 0.3 |
| Syphilis | 5 | 1.5 | 5 | 1.5 | 5 | 1.5 | 5 | 1.5 |
| HD | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Improved ST (year) | 1995 | 1992 | 1992 | 1992 | ||||
| (cured (%))* | M | F | M | F | M | F | M | F |
| NG | 8.1 | 1.7 | 13.5 | 3.4 | 13.5 | 3.4 | 8.1 | 1.7 |
| CT | 2.0 | 0.7 | 3.3 | 1.4 | 3.3 | 1.4 | 2.0 | 0.7 |
| Syphilis | 12.0 | 3.6 | 18 | 6 | 18 | 6 | 12.0 | 3.6 |
| HD | 21.6 | 12.6 | 32.4 | 21 | 32.4 | 21 | 21.6 | 12.6 |
| Commercial sex | ||||||||
| Clients/week | 4 | 2 | 1 | 2 | ||||
| Client visiting frequency (visits/year)† | 0, 2, 24 | 0, 1, 12 | 0, 1, 12 | 0, 1, 12 | ||||
| % Clients/class‡ | ||||||||
| Single | 0.51, 0.40, 0.09 | 0.29, 0.59, 0.12 | 0.27, 0.61, 0.12 | 0.15, 0.65, 0.20 | ||||
| Married | 0.79, 0.21, 0.004 | 0.65, 0.29, 0.06 | 0.64, 0.30, 0.06 | 0.6, 0.35, 0.05 | ||||
| Change in CSW parameters over time | No | Increase in 1993 | No | No | ||||
| Condom use | 10% in 1990 | 10% in 1990 | 10% in 1990 | 10% in 1990 | ||||
| 25% in 1993 | 20% in 1993 | 20% in 1993 | 20% in 1993 | |||||
| 50% in 1995 | 30% in 1995 | 30% in 1995 | 30% in 1995 | |||||
| STI screening | ||||||||
| Frequency | Monthly | 3 monthly | 3 monthly | 1 monthly | ||||
| Coverage (%) | 10% in 1993 | 10% in 1993 | 10% in 1993 | 10% in 1993 | ||||
| 40% in 1995 | 25% in 1995 | 25% in 1995 | 25% in 1995 | |||||
| Model outputs | ||||||||
| Numbers of non-marital partners in past year for males (%) | ||||||||
| 0–1 | 76.5 | 57.3 | 64.5 | 60 | ||||
| 2–4 | 22.2 | 34.7 | 30.7 | 33.9 | ||||
| 5+ | 1.3 | 8.0 | 4.8 | 6.1 | ||||
| % CSWs | 0.7 | 1.8 | 2.3 | 1.3 | ||||
| % Clients by no. of visits | ||||||||
| 1 | 7.4 | 19.8 | 12.9 | 14.6 | ||||
| 2–4 | 13.7 | 13.6 | 9.1 | 10.3 | ||||
| 5+ | 5.4 | 11.3 | 6.2 | 8.2 | ||||
| HIV prevalence among CSWs | 50.3 | 34.8 | 70.7 | 65.4 | ||||