Univariable, OR (95% CI) | P value | Multivariable, aOR (95% CI) Chemsex | P value | Multivariable, aOR (95% CI) Mephedrone | P value | Multivariable, aOR (95% CI) GHB/GBL | P value | Multivariable, aOR (95% CI) Crystal meth | P value | |
Age (IQR), years | 0.96 (0.90 to 0.98) | <0.001 | 0.96 (0.95 to 0.98) | <0.001 | 0.97 (0.95 to 0.98) | <0.001 | 0.96 (0.95 to 0.98) | <0.001 | 0.96 (0.95 to 0.98) | <0.001 |
Condomless anal chemsex† | 0.151 | – | – | – | – | – | – | – | – | |
No | 1 | |||||||||
Yes | 1.33 (0.90 to 1.96) | |||||||||
Sex in <6 months with | 0.003 | 0.007 | 0.012 | 0.007 | 0.007 | |||||
Men | 1 | 1 | 1 | 1 | 1 | |||||
Men and women | 2.38 (1.36 to 4.19) | 2.21 (1.24 to 3.92) | 2.10 (1.18 to 3.75) | 2.20 (1.24 to 3.91) | 2.22 (1.25 to 3.96) | |||||
Chemsex† <6 months | 0.102 | 0.044 | – | – | ||||||
Not using chems during sex | 1 | 1 | – | – | ||||||
Using chems during sex | 1.35 (0.94 to 1.93) | 1.46 (1.01 to 2.11) | ||||||||
Mephedrone (M) use <6 months | 0.010 | – | – | 0.023 | – | – | ||||
Not using M during sex | 1 | 1 | ||||||||
Using M during sex | 2.06 (1.19 to 3.59) | 1.93 (1.10 to 3.40) | ||||||||
GHB/GBL (G) use <6 months | 0.160 | – | – | – | – | 0.079 | ||||
Not using G during sex | 1 | 1 | ||||||||
Using G during sex | 1.30 (0.90 to 1.88) | 1.40 (0.96 to 2.04) | ||||||||
Crystal methamphetamine use (C) <6 months | 0.007 | – | – | – | – | 0.003 | ||||
Not using C during sex | 1 | 1 | ||||||||
Using C during sex | 1.98 (1.20 to 3.26) | 2.18 (1.25 to 3.96) |
*Non-consensual sexual experience was defined as ‘where someone went beyond your limits or where you had an unpleasant experience’ (eg, filmed/photographed without consent, had sexual contact against their will).
†The use of any combination of drugs, including crystal methamphetamine, mephedrone, and/or GHB/GBL before or during sex.
aOR, adjusted OR; GHB/GBL, gamma-hydroxybutyrate/gamma-butyrolacton; MSM, men who have sex with men.