Parameter values for the pair model describing chlamydia transmission
| Parameter | Baseline value | Ranges used in uncertainty analysis |
| Behavioural parameters | ||
| Proportion of people in a partnership, % | 70 | 50–90 |
| Number of new partners, per year | 1.5 | 1–3 |
| Frequency of unprotected sex acts, per week | 1 | * |
| Infection parameters | ||
| Chlamydia prevalence, % | 3 | 1–5 |
| Transmission probability, per sex act | 0.1† | 0–1† |
| Duration of infection, months | 1217 | 6–18 |
| Duration of immunity after natural clearance, months | 315 17 | 1 day to 18 months |
| Intervention parameters | ||
| Treatment failure, % | 81 | 0–15 |
| Probability of notifying the current partner | 0 | 0–0.5 |
| Women testing rate, per year | 0.1‡ | 0.3‡ |
| Duration of repeated testing interval, months | 37 ‡ | |
| Repeated testing uptake, % | 0‡ | 50‡ |
↵* Not explicitly changed in uncertainty analyses but indirectly by changing the transmission probability per sex act to obtain the desired prevalence. This can also be seen as keeping the transmission probability constant but changing the frequency of sex acts from 1.5 times a day to once a month to obtain the prevalence.
↵† Calibrated to the prevalence.
↵‡ Parameter only used in the estimation of the population-level impact (figure 3).