Individuals’ characteristics at BL by PrEP regimen
| Characteristics | Overall (n=624) | Event-based (n=344) | Daily-based (n=280) | P value |
| BL age (years; median (IQR))* | 34.5 (30.1; 40.2) | 34.2 (30.6; 39.7) | 34.8 (29.8; 41.2) | 0.665 |
| Ethnicity†‡ | 0.09 | |||
| Caucasian | 606 (97.1%) | 338 (98.3%) | 268 (95.7%) | |
| Non-Caucasian | 18 (2.9%) | 6 (1.7%) | 10 (3.6%) | |
| Chemsex¶§† | 258 (41.3%) | 137 (39.8%) | 121 (43.2%) | 0.439 |
| Number of sexual partners†§ | 0.221 | |||
| 0–9 | 261 (41.8%) | 143 (41.6%) | 118 (42.1%) | |
| 10-19 | 204 (32.7%) | 121 (35.2%) | 83 (29.6%) | |
| 20–49 | 125 (20.0%) | 66 (19.2%) | 59 (21.1%) | |
| >50 | 34 (5.45%) | 14 (4.07%) | 20 (7.14%) | |
| Previous STI**† | 313 (50.2%) | 165 (48.0%) | 148 (52.9%) | 0.256 |
| HIRI-MSM† | 67 (10.7%) | 35 (10.2%) | 0.881 | |
| 10-19 | 337 (54.0%) | 187 (54.4%) | 32 (11.4%) | |
| 20–29 | 220 (35.3%) | 122 (35.5%) | 150 (53.6%) | |
| >30 | 98 (35.0%) | |||
| Education† | 0.993 | |||
| Middle school | 13 (2.08%) | 7 (2.03%) | 6 (2.14%) | |
| Upper school | 215 (34.5%) | 119 (34.6%) | 96 (34.3%) | |
| University | 396 (63.5%) | 218 (63.4%) | 178 (63.6%) | |
| Year of BL visit† | <0.001 | |||
| 2017 | 58 (9.29%) | 3 (0.87%) | 55 (19.6%) | |
| 2018 | 60 (9.62%) | 20 (5.81%) | 40 (14.3%) | |
| 2019 | 97 (15.5%) | 40 (11.6%) | 57 (20.4%) | |
| 2020 | 99 (15.9%) | 57 (16.6%) | 42 (15.0%) | |
| 2021 | 164 (26.3%) | 111 (32.3%) | 53 (18.9%) | |
| 2022 | 146 (23.4%) | 113 (32.8%) | 33 (11.8%) |
Created by the authors.
*Mann-Whitney test
†Chi-square/Fisher’s exact test.
‡Non-Caucasian category included eight Hispanic/Latino people, eight Black/African-American people and two Asian people.
§Referred to the 3 months prior to BL visit.
¶Sexualised use of either cocaine (hydrochloride or freebase), mephedrone, gamma hydroxybutyrate (GHB), gamma butyrolactone (GBL), crystal methamphetamine, ketamine or methylenedioxypyrovalerone (MDPV).
**Referred to all previous medical history.
BL, baseline; HIRI-MSM, HIV Incidence Risk Index for MSM; MSM, men who have sex with men; STI, sexually transmitted infection.