Frequencies and multivariate analysis for cases of primary syphilis, urethral chlamydia, and urethral gonorrhoea
| Primary syphilis | Urethral chlamydia | Urethral gonorrhoea | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Frequency (%)* | Adjusted OR | p Value | Frequency (%)† | Adjusted OR | p Value | Frequency (%)‡ | Adjusted OR | p Value | |
| Age | |||||||||
| <35 years | 110 (0.5) | 1 | 424 (3) | 1 | 409 (19.2) | 1 | |||
| >35 years | 94 (0.7) | 1.35 (1–1.81) | 0.05 | 249 (3.3) | 1.02 | 0.78 | 209 (13.5) | 0.62 | <0.001 |
| Sexual practices over last 3 months§ | |||||||||
| 0–1 male partners | 57 (0.5) | 1 | – | – | – | 111 (12.8) | 1 | ||
| 2–4 male partners | 71 (0.5) | 1.09 (0.75–1.59) | 0.65 | – | – | – | 261 (17) | 1.39 (1.07–1.8) | 0.01 |
| 5+ male partners | 73 (0.6) | 1.24 (0.85–1.81) | 0.27 | – | – | – | 239 (19.3) | 1.63 (1.26–2.12) | <0.001 |
| No IAS, no RAS | 12 (0.5) | 1 | – | – | – | – | – | – | |
| IAS and/or RAS, CA | 51 (0.4) | 0.80 (0.43–1.51) | 0.5 | – | – | – | – | – | – |
| IAS and/or RAS, C <A | 132 (0.6) | 1.26 (0.7–2.28) | 0.44 | – | – | – | – | – | – |
| No IAS | – | – | – | – | – | – | 44 (14) | 1 | |
| IAS, CA | – | – | – | – | – | – | 169 (15.1) | 0.98 (0.68–1.42) | 0.92 |
| IAS, C < A | – | – | – | – | – | – | 402 (18.4) | 1.39 (0.97–1.98) | 0.07 |
| Sexual practices over the last 12 months§ | |||||||||
| <5 male partners | – | – | – | 195 (2.6) | 1 | – | – | – | |
| 5–10 male partners | – | – | – | 222 (3.2) | 1.24 (1.01–1.52) | 0.04 | – | – | – |
| 10+ male partners | – | – | – | 256 (3.6) | 1.37 (1.13–1.67) | 0.002 | – | – | – |
| No IAS | – | – | – | 16 (1.5) | 1 | – | – | – | |
| IAS, CA | – | – | – | 194 (2.4) | 1.72 (1.03–2.88) | 0.04 | – | – | – |
| IAS, C <A | – | – | – | 455 (3.8) | 2.76 (1.67–4.55) | <0.001 | – | – | – |
*For all MSM with at least one male partner in the previous 12 months. Both IAS and RAS were taken into account during analysis. OR adjusted for age and number of male partners.
†For MSM who only had male partners in the previous 12 months, tested for chlamydia, from 2006 onwards. IAS only taken into account during analysis (as infections at non-urethral sites irrelevant). OR adjusted for age, number of male partners, and symptoms at triage.
‡For all MSM with at least one male partner in the previous 12 months, tested for gonorrhoea, from 2006 onwards. IAS only taken into account during analysis (as infections at non-urethral sites irrelevant). OR adjusted for age, number of male partners, and symptoms at triage.
§For PS and UGC analyses, sexual practices over the last 3 months were analysed. For UCT, sexual practices over the last 12 months were analysed, as it is thought to have a longer incubation period.
C<A, condoms used ‘less than always’; CA, condoms ‘always used’; IAS, insertive anal sex; RAS, receptive anal sex.