Table 2.
Latent classes and posterior probabilities of client-related factors and sexual risk behaviour among MSM attending CSH (n=13 516)
| Class 1 | Class 2 | Class 3 | Class 4 | Class 5 | Class 6 | |
| Lower risk | Intermediate risk | High risk | ||||
| Overall low risk | Western origin and MSP | Non-Western origin and MSP | Living with HIV | Group sex and HIV-positive partners | Group sex and chemsex | |
| n | 2974 | 4182 | 2496 | 827 | 1798 | 1239 |
| % | 22.0 | 30.9 | 18.5 | 6.1 | 13.3 | 9.2 |
| Partners, n* | ||||||
| 0–1 | 0.30 | 0.01 | 0.05 | 0.09 | 0.00 | 0.00 |
| 2–3 | 0.51 | 0.18 | 0.24 | 0.29 | 0.00 | 0.02 |
| 4–9 | 0.19 | 0.53 | 0.52 | 0.34 | 0.16 | 0.23 |
| >10 | 0.00 | 0.28 | 0.19 | 0.27 | 0.84 | 0.75 |
| Anal sex | ||||||
| No | 0.19 | 0.11 | 0.08 | 0.01 | 0.03 | 0.00 |
| Yes, insertive | 0.20 | 0.22 | 0.30 | 0.10 | 0.25 | 0.04 |
| Yes, receptive | 0.17 | 0.10 | 0.13 | 0.15 | 0.10 | 0.05 |
| Yes, both insertive and receptive | 0.44 | 0.57 | 0.49 | 0.73 | 0.62 | 0.91 |
| Origin from an non-Western country† | ||||||
| No | 0.81 | 0.94 | 0.61 | 0.60 | 0.77 | 0.83 |
| Yes | 0.19 | 0.06 | 0.39 | 0.40 | 0.23 | 0.17 |
| Partner from a non-Western country† | ||||||
| No | 0.93 | 0.96 | 0.39 | 0.69 | 0.39 | 0.69 |
| Yes | 0.07 | 0.04 | 0.61 | 0.31 | 0.61 | 0.31 |
| Current HIV status | ||||||
| Negative/unknown‡ | 0.97 | 0.97 | 0.99 | 0.28 | 0.97 | 0.56 |
| Known positive | 0.03 | 0.03 | 0.01 | 0.72 | 0.03 | 0.44 |
| CT/NG/Syphilis infection preceding year | ||||||
| No | 0.88 | 0.83 | 0.80 | 0.52 | 0.69 | 0.36 |
| Yes | 0.12 | 0.17 | 0.20 | 0.48 | 0.31 | 0.64 |
| Sex with known HIV-positive men* | ||||||
| No | 0.64 | 0.47 | 0.36 | 0.13 | 0.18 | 0.05 |
| Don't know | 0.04 | 0.07 | 0.06 | 0.45 | 0.19 | 0.76 |
| Yes | 0.31 | 0.47 | 0.58 | 0.42 | 0.63 | 0.19 |
| Group sex* | ||||||
| No | 1.00 | 0.72 | 0.92 | 0.80 | 0.31 | 0.10 |
| Yes | 0.00 | 0.28 | 0.08 | 0.20 | 0.69 | 0.90 |
| Chemsex*§ | ||||||
| No | 0.99 | 0.91 | 0.96 | 0.90 | 0.82 | 0.30 |
| Yes | 0.01 | 0.09 | 0.04 | 0.10 | 0.18 | 0.70 |
Bold values indicate posterior probabilities higher than 0.60 in each class. Posterior probabilities for an indicator variable within a class sum to 1.
*In the preceding 6 months.
†Non-Western countries include all countries in Latin America, Africa, Eastern Europe and Asia.
‡Current HIV status based on previous self-reported question ‘previously tested for HIV and corresponding result’. Responses ‘yes, result unknown’ and ‘unknown’ were coded as unknown. Current HIV status unknown for n=85.
§Defined as the use of (a combination of) crystal meth, mephedrone or gamma-hydroxybutyric acid/gamma-butyrolactone (GHB/GBL) before or during sex.8 9 20
CSH, centres for sexual health; CT, Chlamydia trachomatis; MSM, men who have sex with men; MSP, multiple sex partners; NG, Neisseria gonorrhoeae.