Aetiology, sexual exposures, adjusted ORs (aORs) and population attributable risks of symptomatic urethritis stratified by sexual behaviours and urethral exposures among men who have sex with men at Public Health—Seattle & King County (PHSKC) STD Clinic, 2001–2013
| Gonorrhoea | Chlamydia | NGNCU | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Controls | Cases | aOR* (95% CI) | PAR% (Range) | Cases | aOR* (95% CI) | PAR% (Range) | Cases | aOR* (95% CI) | PAR% (Range) | |
| Insertive oral sex | 24 009 (93.4) | 1403 (93.0) | 1.57 (1.20 to 2.05) | 33.8% (15.5–47.6%) | 563 (94.0) | 1.03 (0.72 to 1.47) | 2.7% (†–32.0%) | 2787 (95.0) | 1.40 (1.17 to 1.66) | 27.1% (13.8–37.8%) |
| Protected IAI | 7320 (28.5) | 345 (22.9) | 1.14 (0.97 to 1.34) | 2.8% (†–5.8%) | 154 (25.7) | 1.17 (0.91 to 1.51) | 3.7% (†–8.7%) | 744 (25.3) | 0.93 (0.84 to 1.04) | –† (–1.0%) |
| Unprotected IAI | 14 817 (57.6) | 1054 (69.8) | 2.09 (1.79 to 2.45) | 36.4% (30.8–41.3%) | 405 (67.6) | 1.70 (1.34 to 2.16) | 27.8% (17.2%–36.3%) | 1824 (62.1) | 1.17 (1.07 to 1.29) | 9.0% (4.1–14.0%) |
| Vaginal sex | 1088 (4.2) | 24 (1.6) | 0.49 (0.33 to 0.74) | –† | 10 (1.7) | 0.46 (0.25 to 0.87) | –† | 86 (2.9) | 0.73 (0.58 to 0.91) | –† |
| No Sex | 279 (1.1) | 4 (0.3) | 2 (0.3) | 35 (1.2) | ||||||
| Total | 25 705 | 1509 | 599 | 2935 | ||||||
*Mantel–Haenszel’s estimate of the OR. Each statistic represents the odds of having the specific aetiology of symptomatic urethritis given the sexual exposure (row) compared with no report of that sexual behaviour after controlling for all of the other sexual behaviours.
†Not applicable statistic due to null result.
PAR%, population attributable risk per cent.