Crude and adjusted ORs of use of online services compared with use of clinic services for STI testing in Lambeth and Southwark by age group, gender, ethnic group, sexual orientation, positivity and stratified by gender
| Exposure variable | Total population (n=5726) | Men only (n=2481) | Women only (n=3245) | |
| Crude OR (95% CI) | Adjusted OR (95% CI)† | Adjusted OR‡ (95% CI) | Adjusted OR‡ (95% CI) | |
| Age group (years) | ||||
| 16–20 | 1 (ref) | 1 (ref) | 1 (ref) | 1 (ref) |
| 20–25 | 2.63** (2.04 to 3.38) | 2.11** (1.77 to 3.08) | 1.71* (1.00 to 2.94) | 2.42** (1.73 to 3.39) |
| 25–30 | 2.88** (2.24 to 3.69) | 2.33** (2.03 to 3.50) | 2.10* (1.24 to 3.56) | 2.45** (1.75 to 3.43) |
| 30–35 | 2.01** (1.54 to 2.62) | 1.65** (1.43 to 2.57) | 1.47 (0.85 to 2.54) | 1.77 (1.23 to 2.56) |
| 35+ | 0.98 (0.76 to 1.28) | 0.88 (0.78 to 1.39) | 0.81 (0.47 to 1.39) | 0.91 (0.63 to 1.32) |
| Gender | ||||
| Male | 1 (ref) | 1 (ref) | – | – |
| Female | 1.75** (1.57 to 1.95) | 1.82** (1.63 to 2.10) | – | – |
| Ethnic group | ||||
| White British | 1 (ref) | 1 (ref) | 1 (ref) | 1 (ref) |
| White other | 0.33** (0.28 to 0.38) | 0.34** (0.29 to 0.41) | 0.36** (0.28 to 0.48) | 0.34** (0.27 to 0.42) |
| Black African | 0.13** (0.11 to 0.17) | 0.18** (0.15 to 0.23) | 0.17** (0.12 to 0.24) | 0.19** (0.14 to 0.26) |
| Black Caribbean | 0.27** (0.22 to 0.33) | 0.36** (0.29 to 0.45) | 0.26** (0.18 to 0.37) | 0.44** (0.33 to 0.58) |
| Black other | 0.12** (0.98 to 0.16) | 0.16** (0.12 to 0.20) | 0.09** (0.06 to 0.15) | 0.21** (0.15 to 0.29) |
| Mixed white black African or Caribbean | 0.62* (0.47 to 0.82) | 0.71* (0.53 to 0.95) | 0.51* (0.30 to 0.86) | 0.83 (0.58 to 1.19) |
| South Asian | 0.34** (0.22 to 0.52) | 0.41** (0.26 to 0.65) | 0.51* (0.27 to 0.93) | 0.32** (0.17 to 0.62) |
| Any other ethnic group | 0.20** (0.16 to 0.24) | 0.22** (0.18 to 0.27) | 0.26** (0.19 to 0.36) | 0.20** (0.15 to 0.26) |
| Not stated | 0.07** (0.50 to 0.11) | 0.09** (0.06 to 0.13) | 0.06** (0.03 to 0.14) | 0.10** (0.06 to 0.17) |
| Sexual orientation | ||||
| Heterosexual | 1 (ref) | 1 (ref) | 1 (ref) | 1 (ref) |
| Homosexual | 1.32* (1.12 to 1.56) | 2.23** (1.81 to 2.74) | 1.83** (1.45 to 2.31) | 5.05** (2.55 to 10.00) |
| Bisexual | 1.96** (1.42 to 2.69) | 2.10** (1.47 to 3.01) | 2.23* (1.28 to 3.87) | 1.90* (1.20 to 3.04) |
| Unknown | 0.26** (0.18 to 0.38) | 0.36** (0.24 to 0.55) | 0.46* (0.23 to 0.93) | 0.33** (0.20 to 0.54) |
| Tested positive for chlamydia or gonorrhoea | ||||
| No | 1 (ref) | 1 (ref) | 1 (ref) | 1 (ref) |
| Yes | 0.27** (0.22 to 0.33) | 0.30** (0.24 to 0.38) | 0.35** (0.25 to 0.49) | 0.26** (0.19 to 0.37) |
| IMD quintile | 1.29** (1.21 to 1.37) | 1.09* (1.02 to 1.17) | 1.12* (1.00 to 1.24) | 1.07 (0.98 to 1.18) |
Missing data for 16 observations for IMD and 8 observations for ethnic group. Missing data excluded from multivariate analysis.
IMD quintile range 1=5, where 1=most deprived and 5=least deprived entered into the model as a continuous variable (base = 1).
*P≤0.05, **P≤0.001.
†Adjusted for age group, gender, ethnic group, sexual orientation, IMD quintile, tested positive for chlamydia or gonorrhoea.
‡Adjusted for age group, ethnic group, sexual orientation, IMD quintile, tested positive for chlamydia or gonorrhoea.
IMD, Index of Multiple Deprivation.