Results from a stepwise logistic regression* to identify the key socio-demographic characteristics, sexual behaviours and health-related factors† associated with human papillomavirus DNA positivity of high-risk types: men
| % (95% CI) | Crude OR (95% CI) | Adjusted OR (95% CI) | Denominator‡ | |
| All | 9.6 (8.0 to 11.6) | – | – | 1545, 1272 |
| Age at first heterosexual sex, years | p=0.0001 | p=0.0199 | ||
| 18+ | 5.6 (3.6 to 8.5) | 1.00 | 1.00 | 489, 417 |
| 16 or 17 | 9.5 (6.8 to 13.0) | 1.77 (0.98 to 3.23) | 1.23 (0.70 to 2.14) | 572, 461 |
| <16 | 15.7 (11.9 to 20.4) | 3.16 (1.86 to 5.36) | 2.06 (1.19 to 3.56) | 429, 345 |
| Number of sexual partners§ without a condom, last year | p<0.0001 | p=0.0106 | ||
| 0 | 3.6 (1.8 to 7.0) | 1.00 | 1.00 | 319, 301 |
| 1 | 9.1 (7.1 to 11.5) | 2.68 (1.25 to 5.77) | 2.34 (1.13 to 4.89) | 1001, 752 |
| 2+ | 24.1 (17.0 to 33.1) | 8.59 (3.71 to 19.9) | 3.59 (1.56 to 8.29) | 187, 186 |
| Number of new sexual partners,§ last year | p<0.0001 | p=0.0347 | ||
| 0 | 6.7 (5.0 to 8.9) | 1.00 | 1.00 | 1029, 786 |
| 1 | 12.7 (8.4 to 18.8) | 2.03 (1.14 to 3.61) | 1.33 (0.73 to 2.43) | 240, 219 |
| 2+ | 22.6 (16.7 to 29.8) | 4.07 (2.51 to 6.59) | 2.35 (1.23 to 4.48) | 216, 220 |
↵* Variables significant at p<0.10 in the bivariate analyses (supplemental table, available online) were considered in the stepwise logistic regression where the significance level for addition to the model is p<0.10. Note that the resulting model also applies when the significance level for addition is p<0.05. When the significance level for addition is p<0.01, the only variable remaining significant in the model is the ‘number of opposite/same-sex partners without a condom, last year’. No pairwise interactions were statistically significant.
↵† In order to make the model more statistically efficient, response categories were collapsed where there were no significant differences between categories.
↵‡ Weighted, unweighted denominator defined as respondents in Natsal-2 providing a urine sample. Respondents with data missing for 1+ variable(s) were excluded from the multivariate analyses.
↵§ Opposite and/or same sex sexual partner(s).