Table 3. Logistic regression analyses to assess the association of certain characteristics with self-reported pre-exposure prophylaxis use in the previous 12 monthsa, London, United Kingdom, 16 October–9 December 2016.
| Characteristic (total number of respondents with information available) |
n | % | Univariable analysis | Multivariable analysis | ||
|---|---|---|---|---|---|---|
| OR (95% CI) | p value | AOR (95% CI) | p value | |||
| Age category in years (N = 725) | ||||||
| < 25 (n = 77) | 5 | 6.5 | Reference | 0.885 | NA | NA |
| 25–39 (n = 452) | 30 | 6.6 | 1.02 (0.38–2.73) | NA | ||
| ≥ 40 (n = 196) | 11 | 5.6 | 0.86 (0.29–2.55) | NA | ||
| Ethnicity (N = 729) | ||||||
| White (n = 582) | 33 | 5.7 | Reference | 0.161 | NA | NA |
| Non-white (n = 147) | 13 | 8.8 | 1.61 (0.83–3.15) | NA | ||
| Year of education after 16 (N = 728) | ||||||
| None (n = 44) | 4 | 9.1 | Reference | 0.631 | NA | NA |
| < 2 years (n = 105) | 4 | 3.8 | 0.40 (0.09–1.66) | NA | NA | |
| ≥ 2 years (n = 545) | 36 | 6.6 | 0.71 (0.24–2.09) | NA | NA | |
| Still in education (n = 34) | 2 | 5.9 | 0.63 (0.11–3.63) | NA | NA | |
| Employment status (N = 730) | ||||||
| Employed (n = 652) | 40 | 6.1 | 0.78 (0.32–1.91) | 0.594 | NA | NA |
| Tested two or more times in last year (N = 692) | ||||||
| Yes (n = 323) | 30 | 9.3 | 4.10 (1.91–8.76) | <0.001 | 2.13 (0.93–4.88) | 0.074 |
| Number of casualb condomless partners in last year (N = 506) | ||||||
| 0 (n = 206) | 9 | 4.4 | Reference | <0.001 | Reference | 0.007 |
| 1 (n = 154) | 4 | 2.6 | 0.58 (0.18–1.93) | 0.60 (0.18–2.07) | ||
| ≥ 2 (n = 146) | 24 | 16.4 | 4.31 (1.94–9.57) | 2.86 (1.17–6.98) | ||
| Chemsexc (N = 732) | ||||||
| Yes (n = 153) | 23 | 15.0 | 4.28 (2.33–7.86) | <0.001 | 2.31 (1.09–4.91) | 0.030 |
| Had an STI in last year (N = 731) | ||||||
| Yes (n = 143) | 21 | 14.7 | 3.88 (2.10–7.15) | <0.001 | 1.58 (0.72–3.45) | 0.251 |
| Exclusively serosorting (N = 409) | ||||||
| Yes (n = 303) | 21 | 6.9 | 1.50 (0.55–4.09) | 0.424 | NA | NA |
| Oral fluid specimen result (N = 537) | ||||||
| Ab negative (n = 500) | 29 | 5.8 | Reference | 0.569 | NA | NA |
| Ab positive (n = 37) | 3 | 8.1 | 1.43 (0.42–4.95) | NA | ||
Ab: antibody; AOR: adjusted odds ratio; CI: confidence interval; NA: not applicable; OR: odds ratio; PrEP: pre-exposure prophylaxis; STI: sexually transmitted infection.
a Adjusted model contains a total of 480 observations.
b Casual partner is defined as a partner with whom the respondent has had sex with only once.
c Chemsex is defined as use of any of the following drugs before or during sex; mephadrone, ketamine, gammahydroxybutrate (GHB) or methamphetamine in the last 12 months.