Concordance between tests used to diagnosis urethritis among men
| Gram stain result | NAAT result | Total | ||
| Gonorrhoea | Chlamydia | Negative | ||
| Gonorrhoea | 91 | 0 | 0 | 91 |
| NGU | 3* | 87* | 187 | 277* |
| Negative | 14 | 26 | 195 | 235 |
| Total | 108* | 113* | 382 | 600 |
* Three of these results were positive for both gonorrhoea and chlamydia.