Demographic characteristics and sexual behaviour in 3 months prior to completing RiiSH MSM survey (2016–2017), by chemsex participation in the past 12 months
| Non-missing percentage | Univariable logistic regression | |||||
| No chemsex last 12 months (n=3525) (%) | Chemsex in last 12 months (n=397) (%) | Total (n=3933) (%) | OR | CI | Global p value | |
| Recruitment method | ||||||
| App survey | 90.4 | 79.8 | 89.3 | – | – | |
| Clinic survey | 9.6 | 20.2 | 10.7 | 2.39 | 1.82 to 3.13 | <0.001 |
| Age group | ||||||
| 16–29 | 21.1 | 17.6 | 20.7 | – | – | |
| 30–44 | 30.9 | 40.3 | 31.9 | 1.57 | 1.16 to 2.10 | <0.001 |
| 45–59 | 36.0 | 36.0 | 36.0 | 1.20 | 0.88 to 1.62 | |
| 60+ | 12.0 | 6.0 | 11.4 | 1.20 | 0.37 to 0.98 | |
| Ethnic group* | ||||||
| White British/Irish | 81.3 | 71.8 | 80.2 | – | – | |
| White other | 9.0 | 17.6 | 10.0 | 2.20 | 1.65 to 2.94 | 0.049 |
| Black | 2.1 | 2.5 | 2.2 | 1.36 | 0.69 to 2.66 | |
| Asian | 4.0 | 4.3 | 4.1 | 1.23 | 0.73 to 2.07 | |
| Mixed ethnicity | 2.5 | 3.3 | 2.6 | 1.52 | 0.83 to 2.26 | |
| Other | 1.1 | 0.5 | 1.0 | 0.55 | 0.13 to 2.27 | |
| Continent of birth* | ||||||
| UK | 83.0 | 72.3 | 81.9 | – | ||
| Africa | 2.0 | 3.6 | 2.2 | 2.00 | 1.11 to 3.60 | <0.001 |
| Asia | 3.4 | 3.1 | 3.3 | 1.04 | 0.56 to 1.91 | |
| Australasia | 1.0 | 2.8 | 1.2 | 3.19 | 1.60 to 6.36 | |
| Mainland Europe | 7.9 | 14.5 | 8.6 | 2.11 | 1.54 to 2.87 | |
| North America | 1.2 | 1.5 | 1.3 | 1.42 | 0.59 to 3.36 | |
| South America | 1.4 | 2.3 | 1.5 | 1.87 | 0.90 to 3.84 | |
| Highest qualification received* | ||||||
| Below degree | 48.7 | 40.5 | 47.8 | – | – | |
| University degree or higher | 51.3 | 59.5 | 52.2 | 1.40 | 1.13 to 1.73 | 0.002 |
| HIV status* | ||||||
| No known HIV diagnosis | 88.0 | 66.2 | 85.8 | – | – | |
| HIV-positive | 12.0 | 33.8 | 14.2 | 3.74 | 2.96 to 4.71 | <0.001 |
| No. male partners in past 3 months† | ||||||
| None | 11.2 | 4.4 | 10.6 | – | – | |
| 1–5 | 64.9 | 45.3 | 62.9 | 1.78 | 1.05 to 3.02 | <0.001 |
| 6–10 | 13.3 | 20.9 | 14.1 | 4.00 | 2.29 to 6.98 | |
| 11+ | 10.5 | 29.4 | 12.4 | 7.16 | 4.15 to 2.37 | |
| New male sexual partner in past 3 months† | ||||||
| No | 33.0 | 17.1 | 31.4 | – | – | |
| Yes | 67.0 | 82.9 | 68.6 | 2.38 | 1.78 to 3.19 | <0.001 |
| CAS with man in past 3 months* | ||||||
| No | 51.2 | 24.1 | 48.4 | – | – | |
| Yes | 48.8 | 75.9 | 51.6 | 3.30 | 2.59 to 4.2 | <0.001 |
| HIV status of CAS partners(s) in past 3 months among those reporting CAS (no chemsex n=1676, chemsex n=296)‡ | ||||||
| HIV status known: seroconcordant partner(s) only | 60.0 | 48.1 | 58.1 | – | – | |
| HIV status known: at least one serodiscordant partner | 19.7 | 28.3 | 21.1 | 1.79 | 1.30 to 2.47 | 0.001 |
| Unknown HIV serostatus in at least one partner | 20.3 | 23.6 | 20.8 | 1.46 | 1.04 to 2.04 | |
| Total | 100.0 | 100.0 | 100.0 | |||
Non-missing percentages presented.
*Variables have <2.5% missing data with no difference by chemsex participation.
†Variables have 9%–15% missing data with no difference by chemsex participation.
‡Variable has 17.9% missing data among persons reporting CAS: 12% and 18% of those who did and did not report chemsex.
CAS, condomless anal sex; MSM, men who have sex with men; RiiSH, Reducing Inequalities and Improving Sexual Health.