Denominator* | Sample | Crude OR (95% CI) | p Value‡ | aOR§ (95% CI) | p Value¶ | |||
---|---|---|---|---|---|---|---|---|
Internet (2065) | Natsal (117 135) | |||||||
n | % | n† | % (95% CI) | |||||
STI, sexually transmitted infection. | ||||||||
*Weighted, unweighted denominator for men surveyed for Natsal. | ||||||||
†Weighted numerator for men surveyed in Natsal. | ||||||||
‡p Value associated with crude OR derived from bivariate model and with χ2 statistic from comparing proportions for data that are only available at the sample level. | ||||||||
§OR with Natsal 2000 sample as reference group adjusted in final model by †† not working, lives in London, health self-reported as good, age of first sex with male partner; ‡‡ lives in London, country of birth, age of first sex with male partner; §§ student, lives in London, country of birth, age of first sex with male partner; ¶¶ student, not working, holds degree or equivalent, country of birth, age at first sex with male partner. | ||||||||
¶p Value associated with aOR derived from multivariate model. | ||||||||
**Natsal 3-month estimate is calculated for the 13 weeks before the interview. | ||||||||
HIV tested, ever | 1090 | 53.5 | 57 | 53.3 (42.8 to 63.4) | 1.01 (0.66 to 1.55) | 0.958 | — | — |
STI, past year | 346 | 16.9 | 6 | 4.8 (2.2 to 10.4) | 4.01 (1.74 to 9.25) | 0.001 | 4.14 (1.76 to 9.74)†† | 0.001 |
Anal intercourse | ||||||||
3 months v 4 weeks | 1587 | 76.9 | 60 | 51.8 (41.8 to 61.6) | 3.09 (2.04 to 4.68) | <0.001 | 3.24 (2.12 to 4.96)‡‡ | <0.001 |
3 months v 3 months (estimate)** | 1587 | 76.9 | 74 | 63.3 | — | 0.001 | — | — |
3 months v 6 months | 1587 | 76.9 | 81 | 69.3 (59.9 to 77.3) | 1.47 (0.96 to 2.25) | 0.073 | 1.59 (1.03 to 2.45)§§ | 0.036 |
Unprotected anal intercourse | ||||||||
3 months v 4 weeks | 922 | 45 | 29 | 24.9 (17.4 to 34.2) | 2.47 (1.56 to 3.91) | <0.001 | 2.67 (1.66 to 4.31)¶¶ | <0.001 |
3 months v 3 months (estimate)** | 922 | 45 | 42 | 36.6 | — | 0.064 | — | — |
3 months v 12 months | 922 | 45 | 56 | 48.3 (38.7 to 58) | 0.88 (0.59 to 1.3) | 0.513 | — | — |