Table 1. Characteristics of Before-After Cohort Participants at Enrollment.
| Characteristic | Participants, No. (%) (N = 2404)a |
|---|---|
| Age, mean (SD), y | 35.6 (10.4) |
| Age group, y | |
| 18-24 | 285 (12) |
| 25-34 | 1017 (42) |
| 35-44 | 639 (27) |
| ≥45 | 463 (19) |
| Sexual identity | |
| Bisexual | 144 (6) |
| Gay or homosexual | 2260 (94) |
| Country of birth | |
| Australia | 1192 (50) |
| Canada, Ireland, New Zealand, US, or UK | 287 (12) |
| Asia | 350 (15) |
| Europe (excluding UK and Ireland) | 103 (4) |
| Africa | 31 (1) |
| South America, Central America, or Caribbean | 100 (4) |
| Other | 55 (2) |
| Missing | 286 (12) |
| Gay men in postal code, % | |
| ≥20 | 831 (35) |
| 10 to <20 | 268 (11) |
| 5 to <10 | 304 (13) |
| <5 | 1000 (42) |
| Missing | 1 (0) |
| Type of recruiting site | |
| Public sexual health clinic | 1214 (50) |
| Private | 1085 (45) |
| Hospital | 105 (4) |
| Enrollment period | |
| May to June 2016 (early) | 724 (30) |
| July to December 2016 (middle) | 669 (28) |
| January to 2017 to April 2018 (late) | 1011 (42) |
a
Includes participants with testing after enrollment, no record of prior preexposure prophylaxis, and 2 or more tests in the year before enrollment; 587 of 30 549 participants (1.9%) did not have specified anatomical site.