Demographic features of clinic attendees
| Controls (n=63) | Asymptomatic NSU (n=19) | Symptomatic NSU (n=27) | Symptomatic non-NSU (n=7) | |
| Age, mean (SD) | 27.6 (7.1) | 26.7 (7.4) | 28.7 (5.8) | 25.9 (5.2) |
| Smoker (%) | 25 | 33 | 42 | 14 |
| Excess alcohol (%) | 24 | 19 | 16 | 14 |
| Ethnicity white (%) | 73 | 70 | 84 | 57 |
| No history of STI | 64 | 52 | 42 | 14 |
NSU, non-specific urethritis; STI, sexually transmitted infection.