Table 4. Demographic, clinical, and behavioral factors associated with STI presence among PrEP users (N = 110).
| Characteristics | Univariate IRR | p | Multivariate | p |
|---|---|---|---|---|
| Age | ||||
| Age Continuous | 0.970 (0.95–0.99) | <0.001 | 0.978 (0.96–0.99) | 0.007 |
| 20–30 | 1 | |||
| 31–40 | 0.956 (0.76–1.21) | 0.700 | ||
| >40 | 0.690 (0.50–0.95) | 0.022 | ||
| Region of origin | ||||
| Spain | 1 | |||
| Other | 1.078 (0.86–1.35) | 0.506 | ||
| No. of STIs at enrollment visit, that is, before start of PrEP | ||||
| 0 | 1 | |||
| 1 | 0.929 (0.75–1.15) | 0.505 | ||
| 2 | 1.204 (0.89–1.64) | 0.233 | ||
| No. of sexual partners/month before start of PrEP | ||||
| <10 | 1 | |||
| >10 | 1.311 (1.05–1.64) | 0.018 | 1.257 (1.00–1.58) | 0.047 |
| Condom use for anal intercourse before start of PrEP | ||||
| >50% | 1 | |||
| <50% | 1.284 (1.00–1.64) | 0.046 | 1.247 (0.97–1.61) | 0.086 |
| Condomless sex under the effects of recreational drugs | ||||
| No | 1 | |||
| Yes | 1.53 (1.15–2.04) | 0.003 | 1.315 (0.98–1.76) | 0.072 |
| Condomless sex under the effects of recreational drugs, by drug type* | ||||
| Alcohol | 0.977 (0.78–1.23) | 0.847 | ||
| Cannabis | 1.537 (1.14–2.07) | 0.005 | ||
| Poppers | 1.184 (0.97–1.44) | 0.089 | ||
| Cocaine | 1.321 (1.06–1.64) | 0.012 | ||
| Ecstasy | 1.097 (0.78–1.54) | 0.782 | ||
| MDMA | 1.095 (0.86–1.40) | 0.469 | ||
| GHB | 1.592 (1.30–1.94) | <0.001 | ||
| Mephedrone | 1.543 (1.27–1.87) | <0.001 | ||
| Methamphetamine | 1.453 (1.17–1.80) | 0.001 | ||
| Chemsex | ||||
| No | 1 | |||
| Yes | 1.363 (1.12–1.66) | 0.002 | ||
| Dating apps | ||||
| No | 1 | |||
| Yes | 1.442 (1.06–1.96) | 0.019 | 1.278 (0.93–1.75) | 0.126 |
* Each of the drugs are evaluated as yes/no and the reference category is "no".