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# Table 1
**Parameter values describing the natural history of chlamydia infection, PID development and the screening intervention**

Parameters | Baseline values | Explanation | Sensitivity analysis | Source | ||
---|---|---|---|---|---|---|

Distribution | Parameters | |||||

| ||||||

| Force of infection (per day), calculated using | |||||

| 365 | N(μ,σ | μ=365 | σ | Consensus | |

| 5.7% | Prevalence at baseline [11] | Bin(n,p) | n=2519 | \text{p}=\frac{143}{2519} | [11] |

| Effective testing rate (per day), calculated using | |||||

| 22.2% | Coverage of testing uptake (per year) [11] | Bin(n,p) | n=2377 | \text{p}=\frac{527}{2377} | [11] |

| 8.0% | Treatment failure [17] | U(a,b) | a=0% | b=50% | Consensus |

| estimated | Fraction of women becoming infected with chlamydia who will develop PID | ||||

| ||||||

| 30.0% | Proportion of PID cases due to chlamydia in control group [11] | Bin(n,p) | n=23 | \text{p}=\frac{7}{23} | [11] |