PY | n* | Incidence (per 100 PY) | Univariate | Multivariate | |||
HR (95% CI) | p Value | Adjusted HR (95% CI) | p Value | ||||
Number of male partners last 6 months | p = 0.011† | p = 0.269† | |||||
1–5 | 1817.2 | 4 | 0.22 | 1 | 1 | ||
6–10 | 670.6 | 5 | 0.75 | 3.28 (0.88 to 12.23) | 1.81 (0.49 to 6.61) | ||
>10 | 1421.6 | 14 | 0.98 | 4.20 (1.38 to 12.79) | 1.94 (0.61 to 6.17) | ||
Dry kissing‡ | p = 0.518† | – | |||||
Never | 480.5 | 3 | 0.62 | 1 | – | ||
Occasionally | 1340.9 | 14 | 1.04 | 1.81 (0.52 to 6.29) | – | ||
Often | 1474.7 | 8 | 0.54 | 0.92 (0.24 to 3.47) | – | ||
Wet kissing‡ | p = 0.360† | – | |||||
Never | 287.8 | 2 | 0.69 | 1 | – | ||
Occasionally | 1167.7 | 12 | 1.03 | 1.51 (0.34 to 6.77) | – | ||
Often | 1842.4 | 11 | 0.60 | 0.85 (0.19 to 3.82) | – | ||
Receptive penile–oral sex without ejaculation¶ | p = 0.233† | – | |||||
Never | 167.3 | 1 | 0.60 | 1 | – | ||
Occasionally | 968.9 | 4 | 0.41 | 0.70 (0.078 to 6.24) | – | ||
Often | 2161.7 | 20 | 0.93 | 1.47 (0.20 to 10.95) | – | ||
Receptive penile-oral sex with ejaculation§ | p = 0.002† | p = 0.009† | |||||
Never | 2461.3 | 13 | 0.53 | 1 | 1 | ||
Occasionally | 709.3 | 8 | 1.13 | 2.12 (0.88 to 5.11) | 1.84 (0.70 to 4.83) | ||
Often | 126.3 | 4 | 3.17 | 5.65 (1.83 to 17.42) | 5.33 (1.70 to 16.71) | ||
Insertive oro-anal sex§ | p = 0.392† | – | |||||
Never | 1496.3 | 8 | 0.53 | 1 | – | ||
Occasionally | 1332.4 | 14 | 1.05 | 1.96 (0.82 to 4.68) | – | ||
Often | 469.3 | 3 | 0.64 | 1.26 (0.33 to 4.74) | – |
*n does not always total 25 due to missing data; †p for trend; ‡wet (dry) kissing refers to kissing where one or both partners (do not) insert their tongue(s) into each other’s mouth(s); ¶receptive penile-oral sex refers to a study participant taking a partner’s penis into his mouth; with or without ejaculation refers to whether ejaculation occurred in the study participant’s mouth; §insertive oro-anal sex refers to a study participant applying his tongue on to, or inserting his tongue into, a partner’s anus. PY, person-years.