Socio-demographic characteristics of individuals who tested for STIs in clinics and through online services in Lambeth and Southwark between 1 January and 31 March 2016 (n=5747)
| Exposure variable | Clinic users, n (%) | Online users, n (%) | Total users (%) | P value (X2) |
| Age group (years) | ||||
| 16–20 | 257 (8.0) | 101 (4.0) | 358 (6.2) | <0.001 |
| 20–25 | 746 (23.3) | 770 (30.2) | 1516 (26.4) | |
| 25–30 | 844 (26.4) | 954 (37.4) | 1798 (31.3) | |
| 30–35 | 500 (15.6) | 395 (15.5) | 895 (15.6) | |
| 35+ | 851 (26.6) | 329 (12.9) | 1180 (20.5) | |
| Gender | ||||
| Male | 1578 (49.3) | 911 (35.7) | 2489 (43.3) | <0.001 |
| Female | 1620 (50.7) | 1638 (64.3) | 3258 (56.7) | |
| Ethnic group | ||||
| White British | 751 (23.5) | 1482 (58.3) | 2233 (38.9) | <0.001 |
| White other | 505 (15.8) | 324 (12.7) | 829 (14.4) | |
| Black African | 444 (13.9) | 116 (4.6) | 560 (9.7) | |
| Black Caribbean | 314 (9.8) | 166 (6.5) | 480 (8.4) | |
| Black other | 399 (12.5) | 97 (3.8) | 496 (8.6) | |
| Mixed white black African or Caribbean | 101 (3.2) | 124 (4.9) | 225 (3.9) | |
| South Asian | 54 (1.7) | 36 (1.4) | 90 (1.6) | |
| Any other ethnic group | 430 (13.5) | 170 (6.7) | 600 (10.4) | |
| Not stated | 200 (6.3) | 29 (1.1) | 229 (5.2) | |
| Sexual orientation | ||||
| Heterosexual | 2648 (82.8) | 2083 (81.7) | 4731 (82.3) | <0.001 |
| Homosexual | 319 (10.0) | 332 (13.0) | 651 (11.3) | |
| Bisexual | 65 (2.0) | 100 (3.9) | 165 (2.9) | |
| Unknown | 166 (5.2) | 34 (1.3) | 200 (2.5) | |
| Tested positive for chlamydia or gonorrhoea | 461 (14.4) | 111 (4.4) | 572 (10.0) | <0.001 |
| IMD quintile | ||||
| 1 (most deprived) | 1324 (41.5) | 791 (31.1) | 2115 (36.8) | <0.001 |
| 2 | 1272 (39.9) | 1122 (44.2) | 2394 (41.7) | |
| 3 | 480 (15.1) | 494 (19.4) | 974 (17.0) | |
| 4 | 102 (3.2) | 117 (4.6) | 219 (3.8) | |
| 5 (least deprived) | 12 (0.4) | 17 (0.7) | 29 (0.5) | |
| Total | 3198 (55.7) | 2549 (44.3) | 5747 |
Missing data for 16 observations for IMD and 8 observations for ethnic group.
IMD, Index of Multiple Deprivation.