Definitions and values of parameters used in our analysis
| Parameter | Definition | ||
| λ | Incidence of infection (per year)* | HIV | 0.1/100 |
| Syphilis | 0.1/100 | ||
| Chlamydia | 3.3/100 | ||
| Gonorrhoea | 0.7/100 | ||
| β′ | Probability of transmission from an infected sex worker to a male client per unprotected penetrative penile–vaginal exposure | Primary HIV | 0.003 |
| Syphilis | 0.15 | ||
| Chlamydia | 0.35 | ||
| Gonorrhoea | 0.22 | ||
| p | Proportion (%) of penetrative penile–vaginal exposures in which condoms are used | 99 | |
| ε | Efficacy (%) of condoms | 95 | |
| b | Proportion (%) of penetrative penile–vaginal acts using condoms where breakage or slippage of condom occurs | 2.5 | |
| n | Mean no of clients per sex worker per week | 15 | |
| q | Quality-adjusted life years lost due to an infection | HIV | 7.5 |
| Chlamydia | (3 days) | ||
| c | Cost ($A) per test(s) | Chlamydia+gonorrhoea | 57.35† |
| Chlamydia+gonorrhoea+HIV+syphilis | 82.65† | ||