Table 1. Baseline characteristics of participants retained through the end of study.
| Characteristic | Retained N (%)† (n=437) |
Not retained N (%) (n=120) |
Unadj. p value |
Adj. p value* |
|---|---|---|---|---|
|
| ||||
| Site | ||||
| San Francisco | 253 (84.3) | 47 (15.7) | <0.001 | N/A |
| Miami | 98 (62.4) | 59 (37.6) | ||
| Washington DC | 86 (86.0) | 14 (14.0) | ||
|
| ||||
| Age, No. (%) | ||||
| 18-25 | 77 (68.8) | 35 (31.3) | 0.009 | 0.12 |
| 26-35 | 161 (77.0) | 48 (23.0) | ||
| 36-45 | 115 (85.8) | 19 (14.2) | ||
| >45 | 84 (82.4) | 18 (17.7) | ||
|
| ||||
| Race/ethnicity, No. (%) | ||||
| White | 226 (85.0) | 40 (15.0) | 0.002 | 0.53 |
| Latino | 139 (72.4) | 53 (27.6) | ||
| Black | 25 (62.5) | 15 (37.5) | ||
| Asian | 21 (80.8) | 5 (19.2) | ||
| Other | 26 (81.3) | 6 (18.8) | ||
|
| ||||
| Gender | ||||
| Male | 430 (78.5) | 118 (21.5) | 0.65 | 0.49 |
| Transgender woman | 5 (71.4) | 2 (28.6) | ||
| Other | 2 (100) | 0 (0) | ||
|
| ||||
| Education level. No. (%) | ||||
| ≤ High School | 55 (67.1) | 27 (32.9) | 0.04 | 0.41 |
| Some college | 119 (78.8) | 32 (21.2) | ||
| College graduate | 156 (79.6) | 40 (20.4) | ||
| Any post graduate | 107 (83.6) | 21 (16.4) | ||
|
| ||||
| Income, No. (%) | ||||
| <$20,000 | 128 (69.6) | 56 (30.4) | <0.001 | 0.07 |
| $20,000-$59,999 | 158 (81.0) | 37 (19.0) | ||
| ≥$60,000 | 139 (87.4) | 20 (12.6) | ||
|
| ||||
| Health insurance, No. (%) | ||||
| No | 149 (71.6) | 59 (28.4) | 0.002 | 0.28 |
| Yes | 288 (82.8) | 60 (17.2) | ||
|
| ||||
| Living situation, No. (%) | ||||
| Rent or own housing | 362 (81.2) | 36 (32.4) | 0.002 | 0.07 |
| Other (live with friends/family, public housing, homeless) | 75 (67.6) | 84 (18.8) | ||
|
| ||||
| Referral status, No. (%) | ||||
| Self-referred | 252 (84.6) | 74 (28.6) | <0.001 | 0.08 |
| Clinic-referred | 185 (71.4) | 46 (15.4) | ||
|
| ||||
| Prior PrEP knowledge, No, (%) | ||||
| No | 91 (64.1) | 51 (35.9) | <0.001 | 0.01 |
| Yes | 346 (83.4) | 69 (16.6) | ||
|
| ||||
| ncRAI, past 3 mo, at baseline, No.(%) | ||||
| No | 125 (68.3) | 58 (31.7) | <0.001 | 0.002 |
| Yes | 312 (83.4) | 62 (16.6) | ||
|
| ||||
| Post-exposure prophylaxis (PEP) use at baseline visit, No. (%) | ||||
| No | 422 (78.4) | 116 (21.6) | 0.96 | 0.63 |
| Yes | 15 (79.0) | 4 (21.1) | ||
|
| ||||
| Alcohol: ≥5 drinks/day when drinking, past 3 mo | ||||
| No | 388 (79.2) | 102 (20.8) | 0.29 | 0.58 |
| Yes | 47 (73.4) | 17 (26.6) | ||
|
| ||||
| Any recreational drug use, past 3 mo | ||||
| No | 111 (77.6) | 32 (22.4) | 0.79 | 0.56 |
| Yes | 325 (78.7) | 88 (21.3) | ||
|
| ||||
| Amphetamine use, past 3 mo | ||||
| No | 365 (77.3) | 107 (22.7) | 0.10 | 0.36 |
| Yes | 71 (85.5) | 12 (14.5) | ||
|
| ||||
| Polysubstance use, past 3 mo‡ | ||||
| No | 342 (77.0) | 102 (23.0) | 0.11 | 0.36 |
| Yes | 94 (83.9) | 18 (16.1) | ||
|
| ||||
| Injection drug use, past 3 mo | ||||
| No | 429 (78.4) | 118 (21.6) | 0.96 | 0.55 |
| Yes | 7 (77.8) | 2 (22.2) | ||
|
| ||||
| Use of testosterone or anabolic steroids, past 3 mo | ||||
| No | 425 (78.3) | 118 (21.7) | 0.51 | 0.48 |
| Yes | 12 (85.7) | 2 (14.3) | ||
†
Retained participants include those who completed their 48 week visit, regardless of prior missed visits.
*
Adjusted for site; unadj = unadjusted; adj. = adjusted. No.= number. ncRAI = condomless receptive anal sex; N/A = not applicable
‡
Polysubstance use defined as use of 3 or more of the following substances in the past 3 months: poppers, ecstasy, GHB, cocaine, methamphetamine, erectile dysfunction drugs.