Participant sociodemographic and behaviour characteristics
| Characteristic | No. (%) of participants* n = 52 |
|---|---|
| Age, yr, median (IQR) | 33 (28–37) |
| Race | |
| White | 38 (73) |
| Asian | 4 (8) |
| Latino | 3 (6) |
| Middle Eastern | 3 (6) |
| Other† | 4 (8) |
| Sexual orientation | |
| Gay | 49 (94) |
| Bisexual‡ | 3 (6) |
| Education | |
| High school or some postsecondary | 14 (27) |
| Undergraduate | 23 (44) |
| Graduate | 15 (29) |
| Annual income, $ | |
| ≤ 20 000 | 9 (17) |
| 20 001–40 000 | 11 (21) |
| 40 001–60 000 | 14 (27) |
| 60 001–80 000 | 7 (13) |
| 80 001–100 000 | 5 (10) |
| > 100 000 | 6 (12) |
| No. of prescription medications, median (IQR) | 0 (0–1) |
| No. of supplements, median (IQR) | 1 (0–3) |
| Current smoker | 13 (25) |
| Previous sexually transmitted infection diagnosis | |
| Gonorrhea | 21 (40) |
| Chlamydia | 24 (46) |
| Syphilis | 10 (19) |
| Any bacterial sexually transmitted infection | 36 (69) |
| Baseline HIV Incidence Risk Index for MSM score, median (IQR) | 29 (22.5–33.0) |
| Recreational drug use in prior 3 mo | |
| Amphetamines (crystal) | 9 (17) |
| “Poppers” | 36 (69) |
| Baseline sexual behaviours in prior 6 mo, median (IQR) | |
| No. of partners | 18 (12–30.5) |
| No. of HIV-positive partners | 1 (0–3) |
| Condomless receptive anal sex, no. of times | 5 (2–15) |
| Condomless receptive anal sex with HIV-positive partner, no. of times | 0 (0–0) |
| Condomless insertive anal sex, no. of times | 5 (2–12.5) |
| Condomless insertive anal sex with HIV-positive partner, no. of times | 0 (0–3) |