Multivariable conditional logistic regression analysis of kissing and other oral sexual practices with casual sexual partners between cases with oropharyngeal gonorrhoea and controls without oropharyngeal gonorrhoea, consisting of men who have sex with men attending the Melbourne Sexual Health Centre in 2015.
| Beta coefficient* | Controls | Cases | Crude OR (95% CI) | P value | aOR (95% CI) | P value | VIF | |
| Tongue kissing | ||||||||
| ≤75% of CSP | 0.83 | 139 (40.9%) | 58 (33.5%) | Ref | Ref | |||
| >75% of CSP | 201 (59.1%) | 115 (66.5%) | 1.38 (0.94 to 2.03) | 0.103 | 1.55 (0.96 to 2.49) | 0.071 | 2.81 | |
| Receptive fellatio with ejaculation | ||||||||
| ≤50% of CSP | 0.59 | 253 (75.3%) | 120 (70.6%) | Ref | Ref | |||
| >50% of CSP | 83 (24.7%) | 50 (29.4%) | 1.29 (0.85 to 1.95) | 0.237 | 1.33 (0.84 to 2.12) | 0.219 | 2.60 | |
| Receptive fellatio without ejaculation | ||||||||
| ≤75% of CSP | 0.84 | 176 (52.5%) | 87 (50.6%) | Ref | Ref | |||
| >75% of CSP | 159 (47.5%) | 85 (49.4%) | 1.11 (0.76 to 1.60) | 0.594 | 0.85 (0.53 to 1.34) | 0.474 | 1.59 | |
| Insertive rimming | ||||||||
| ≤50% of CSP | 0.52 | 252 (74.6%) | 133 (76.9%) | Ref | Ref | |||
| >50% of CSP | 86 (25.4%) | 40 (23.1%) | 0.92 (0.60 to 1.42) | 0.714 | 0.72 (0.44 to 1.18) | 0.195 | 1.57 | |
For some questions, data are missing because either the study participants did not answer that question on the survey or because they answered “I don’t know.”
*Beta coefficient of the linear regression of the log-transformed input variables.
aOR, adjusted OR, adjusted for the other binary variables listed; CSP, number of casual sexual partners in the last 3 months; fellatio, oro-penile sex; rimming, oro-anal sex; VIF, variance inflation factor.