Characteristics of participants, stratified by year
| Characteristic | Total n=2546 | March–September 2019 n=1554 | March–September 2021 n=992 | P value* |
| N (%) | N (%) | N (%) | ||
| Age (years) | ||||
| <25 | 317 (12.5) | 188 (12.1) | 129 (13.0) | 0.02* |
| 25–34 | 1186 (46.6) | 711 (45.8) | 475 (47.9) | |
| 35–44 | 538 (21.1) | 312 (20.1) | 226 (22.8) | |
| 44–54 | 273 (10.7) | 184 (11.8) | 89 (9.0) | |
| ≥55 | 232 (9.1) | 159 (10.2) | 73 (7.4) | |
| Race | ||||
| White | 1835 (72.1) | 1092 (70.3) | 743 (74.9) | <0.001* |
| American Indian/Alaskan Native | 33 (1.3) | 22 (1.4) | 11 (1.1) | |
| Asian | 246 (9.7) | 161 (10.4) | 85 (8.6) | |
| Pacific Islander/Native Hawaiian | 30 (1.2) | 22 (1.4) | 8 (0.8) | |
| Black/African-American | 183 (7.2) | 101 (6.5) | 82 (8.3) | |
| Other | 84 (3.3) | 51 (3.3) | 33 (3.3) | |
| Multiracial | 88 (3.5) | 59 (3.8) | 29 (2.9) | |
| Does not want to report | 47 (1.9) | 46 (3.0) | 1 (0.1) | |
| Ethnicity | ||||
| Hispanic/Latino | 943 (37.0) | 545 (35.1) | 398 (40.1) | 0.02* |
| Not Hispanic/Latino | 1596 (62.7) | 1003 (64.5) | 593 (59.8) | |
| Did not report | 7 (0.3) | 6 (0.4) | 1 (0.1) | |
| Sex at birth | ||||
| Male | 2543 (99.9) | 1552 (99.9) | 991 (99.9) | 1.00 |
| Did not report | 3 (0.1) | 2 (0.1) | 1 (0.1) | |
| Gender identity | ||||
| Male | 2515 (98.8) | 1534 (98.7) | 981 (98.9) | 0.54 |
| Do not identify as female, male or transgender | 1 (0.0) | 1 (0.1) | 0 (0.0) | |
| Non-binary/Genderqueer/Gender fluid/Agender | 25 (1.0) | 14 (0.9) | 11 (1.1) | |
| Another identity not listed | 2 (0.1) | 2 (0.1) | 0 (0.0) | |
| Did not report | 3 (0.1) | 3 (0.2) | 0 (0.0) | |
| Sexual orientation | ||||
| Gay | 2053 (80.6) | 1286 (82.8) | 767 (77.3) | 0.001* |
| Bisexual | 390 (15.3) | 201 (12.9) | 189 (19.1) | |
| Straight (heterosexual) | 32 (1.3) | 22 (1.4) | 10 (1.0) | |
| Queer | 41 (1.6) | 26 (1.7) | 15 (1.5) | |
| Another orientation not listed | 27 (1.1) | 18 (1.2) | 9 (0.9) | |
| Did not report | 3 (0.1) | 1 (0.1) | 2 (0.2) | |
| Sexual behaviours | ||||
| N (%) | N (%) | N (%) | ||
| Venue where MSM met sex partners | ||||
| No new sex partners in the past 3 months (only existing partners) | 668 (26.2) | 342 (22.0) | 326 (32.9) | <0.001* |
| In-person venues | 430 (16.9) | 297 (19.1) | 133 (13.4) | |
| Bar/Club | 128 (29.8) | 70 (23.6) | 58 (43.6) | |
| Bathhouse/Sex club | 16 (3.7) | 13 (4.4) | 3 (2.3) | |
| Friends/Acquaintances | 238 (55.3) | 184 (61.9) | 54 (40.6) | |
| Gym | 17 (4.0) | 9 (3.0) | 8 (6.0) | |
| Outdoor | 12 (2.8) | 8 (2.7) | 4 (3.0) | |
| Work/School | 19 (4.4) | 13 (4.4) | 6 (4.5) | |
| Online venues | 1448 (56.9) | 915 (58.9) | 533 (53.7) | |
| Online only | 851 (58.8) | 480 (52.5) | 371 (69.6) | |
| Online and in-person | 597 (41.2) | 435 (47.5) | 162 (30.4) | |
| PrEP use in the past 2 weeks | ||||
| Yes | 462 (18.2) | 308 (19.8) | 154 (15.5) | 0.01* |
| No | 2082 (81.8) | 1244 (80.1) | 838 (84.5) | |
| Did not report | 2 (0.1) | 2 (0.1) | 0 (0.0) | |
| Drug use in the past 3 months† | ||||
| Yes | 389 (15.3) | 239 (15.4) | 150 (15.1) | 0.90 |
| No | 2157 (84.7) | 1315 (84.6) | 842 (84.9) | |
| Median (IQR) | Median (IQR) | Median (IQR) | ||
| Number of sex partners in past 3 months | 3 (2, 5) | 3 (2, 5) | 3 (2, 5) | <0.001* |
*P values were calculated using χ2 test for age, Wilcoxon rank-sum test for sex partners and Welch’s t-tests for continuous variables and are statistically significant at the 0.05 level.
†Excludes alcohol and marijuana.
PrEP, pre-exposure prophylaxis.