Correlates of annual testing for chlamydia/gonorrhoea among participants attending selected clinics of the OHTN Cohort Study
| Person years of observation* | Per cent tested | Unadjusted OR (95% CI) | Adjusted OR (95% CI) | |
|---|---|---|---|---|
| Each additional calendar year | 1.20 (1.14 to 1.25) | 1.27 (1.17 to 1.39) | ||
| Sex | ||||
| Male: MSM | 5722 | 28.5 | Referent | Referent |
| Male: non-MSM | 898 | 7.1 | 0.19 (0.14 to 0.27) | 0.47 (0.35 to 0.64) |
| Female | 1289 | 17.6 | 0.54 (0.44 to 0.67) | 0.91 (0.73 to 1.14) |
| Age (years) | ||||
| <30 | 320 | 40.0 | Referent | |
| 30–39 | 1209 | 33.3 | 0.76 (0.56 to 1.03) | |
| 40–49 | 3309 | 25.4 | 0.54 (0.40 to 0.72) | |
| 50+ | 3218 | 17.3 | 0.36 (0.26 to 0.48) | |
| Each additional decade | 0.68 (0.63 to 0.73) | 0.72 (0.67 to 0.77) | ||
| Region | ||||
| Other | 1208 | 3.9 | Referent | Referent |
| Toronto | 6848 | 27.5 | 9.38 (6.71 to 13.1) | 2.27 (1.61 to 3.19) |
| Viral load tests in calendar year | ||||
| 1 test | 705 | 15.6 | Referent | Referent |
| 2–3 tests | 4015 | 21.9 | 1.39 (1.16 to 1.68) | 1.65 (1.25 to 2.15) |
| 4 or more tests | 3172 | 29.3 | 1.83 (1.51 to 2.21) | 2.72 (2.07 to 3.59) |
| Clinic type | ||||
| Tertiary | 4748 | 9.7 | Referent | Referent |
| Primary | 3308 | 44.4 | 7.35 (6.31 to 8.56) | 3.81 (3.24 to 4.48) |
| Tested for chlamydia/gonorrhoea in previous year | ||||
| No | 5799 | 13.4 | Referent | Referent |
| Yes: non-reactive | 1392 | 59.9 | 26.4 (22.6 to 30.9) | 7.03 (5.92 to 8.34) |
| Yes: reactive | 106 | 75.5 | 47.6 (25.3 to 89.4) | 15.6 (9.04 to 27.0) |
Multiple logistic regression with generalised estimating equations. Each person year was modelled as a unique observation (n=8056 person-years among 2854 participants). We excluded the year 2008 and any participant with less than two years of prospective follow-up to allow for estimation of the effect of having tested in the previous calendar year. See text for details.
*The sum total of years that participants were under observation.
MSM, men who have sex with men.