Adjusted risk ratios for Chlamydia trachomatis diagnosis in the chlamydia testing model
| Covariate | Adjusted risk ratio (95% CI) | p Value* |
|---|---|---|
| Gender | ||
| Women | 1.15 (0.84 to 1.56) | 0.382 |
| Men | 1.00 | |
| Age group | ||
| 20–24 | 2.10 (1.21 to 3.65) | 0.008 |
| 25–29 | 1.57 (0.91 to 2.72) | 0.105 |
| 30–34 | 1.47 (0.81 to 2.66) | 0.206 |
| 35–40 | 1.00 | |
| Reason for current chlamydia testing | ||
| Casual sex/check-up | 1.00 | |
| Contact with chlamydia case | 6.55 (4.77 to 8.98) | <0.001 |
| Symptoms | 2.19 (1.48 to 3.24) | <0.001 |
| Ct test (past 12 months) | ||
| No | 1.00 | |
| Yes | 0.72 (0.55 to 0.94) | 0.014 |
| Don't remember | 1.10 (0.65 to 1.87) | 0.730 |
| Number of sexual partners (past 12 months) | ||
| 0–2 partners | 1.00 | |
| 3–5 partners | 1.12 (0.81 to 1.55) | 0.498 |
| 6–10 partner | 1.53 (1.06 to 2.21) | 0.023 |
| ≥11 partners | 1.61 (0.94 to 2.76) | 0.082 |
| Time since the last sexual contact | ||
| Past 7 days | 0.70 (0.48 to 1.01) | 0.056 |
| 1–4 weeks | 0.95 (0.66 to 1.37) | 0.784 |
| 1–3 months | 1.00 | |
| ≥4 months | 1.47 (0.71 to 3.05) | 0.301 |
| Don't remember | 1.37 (0.20 to 9.43) | 0.751 |
| Type of the last sexual contact | ||
| Vaginal and oral and petting | 1.00 | |
| Vaginal | 1.17 (0.86 to 1.61) | 0.319 |
| Vaginal and oral | 0.77 (0.51 to 1.17) | 0.219 |
| Vaginal and petting | 0.81 (0.47 to 1.40) | 0.460 |
| Vaginal and oral and petting and anal | 1.84 (1.09 to 3.10) | 0.023 |
| Alcohol use before having sex (past 6 months) | ||
| Yes | 1.98 (1.10 to 3.57) | 0.023 |
| No | 1.00 | |
| Men presenting symptoms at clinic visit† | ||
| Yes | 2.09 (1.38 to 3.18) | 0.001 |
| No | 1.00 | |
| Women presenting symptoms at clinic visit† | ||
| Yes | 1.08 (0.71 to 1.65) | 0.706 |
| No | 1.00 | |
*p Value from the Wald test.
†p=0.017 for the interaction term ‘gender×symptoms’.