Participant characteristics and sexual health information at baseline by intervention and control group
| Intervention (n=214) | Control (n=219) | All (n=433) | |
| Sociodemographic characteristics | |||
| Age mean (range) | 20.2 (18–23) | 19.9 (18–23) | 20.0 (18–23) |
| Female sex, n/N (%) | 144/214 (67.3) | 148/219 (67.6) | 292/433 (67.4) |
| Education, n/N (%) | |||
| Elementary school | 8/214 (3.7) | 14/219 (6.4) | 22/433 (5.1) |
| Upper secondary school | 162/214 (75.7) | 170/219 (77.6) | 332/433 (76.7) |
| University | 44/214 (20.6) | 35/219 (16.0) | 79/433 (18.2) |
| Occupation, n/N (%) | |||
| Working/student | 208/214 (97.2) | 209/219 (95.4) | 417/433 (96.3) |
| Unemployed | 6/214 (2.8) | 10/219 (4.6) | 16/433 (3.7) |
| Living arrangements, n/N (%) | |||
| Living with parents | 159/214 (74.3) | 165/219 (75.3) | 324/433 (74.8) |
| Left parents’ home | 55/214 (25.7) | 54/219 (24.7) | 109/433 (25.2) |
| Relationship status, n/N (%) | |||
| Presently single | 93/214 (43.5) | 95/219 (43.4) | 188/433 (43.4) |
| One or more sexual partners (not in a steady relationship*) | 103/214 (48.1) | 95/219 (43.4) | 198/433 (45.7) |
| Sexual health characteristics | |||
| Heterosexual, n/N (%) | 206/214 (96.3) | 206/219 (94.1) | 412/433 (95.2) |
| Mean age at first intercourse | 15.8 (12–20) | 15.8 (11–21) | 15.8 (11–21) |
| Mean number of lifetime partners | 17.1 (2–110) | 14.3 (2–90) | 15.8 (2–110) |
| Ever experienced pregnancy, n/N (%) | 26/214 (12.2) | 30/219 (13.7) | 56/433 (12.9) |
| Contraceptive use (women only), n/N (%) | 102/144 (70.8) | 109/148 (73.6) | 211/292 (72.3) |
| Characteristics reflecting sexual risk | |||
| Fully protected intercourses past 6 months (100% condom use), n/N (%) | 19/214 (8.9) | 25/219 (11.4) | 44/433 (10.2) |
| Concurrent sexual relationships (yes/yes I think so), n/N (%) | 154/214 (72.0) | 149/219 (68.0) | 303/433 (70.0) |
| Alcohol/drug with temporary partner (always/often), n/N (%) | 118/214 (55.1) | 105/219 (48.8) | 223/433 (51.5) |
| Ever had STI, n/N (%) | 88/214 (41.1) | 89/219 (40.6) | 177/433 (40.9) |
| Testing habits for STI, n/N (%) | |||
| I never tested | 17/214 (7.9) | 23/219 (10.5) | 40/433 (9.2) |
| I test once per year | 75/214 (35.1) | 77/219 (35.2) | 152/433 (35.1) |
| I test more often than once per year | 122/214 (57.0) | 119/219 (54.3) | 241/433 (55.7) |
*A steady relationship was ascribed to a participant with only one partner, with both members of partnership being mutually ‘faithful’ to each other sexually.