Table 5.
Concordance of rectal chlamydia and urethral chlamydia between men in 352 partnerships who reported anal sex without condoms
| Urethra negative | Urethra positive | Total | Urethral chlamydia positivity % (95% CI) | |
|---|---|---|---|---|
| Rectum negative | 652 | 12 | 664 | 1.8 (0.9 to 3.1) |
| Rectum positive | 27 | 13 | 40 | 32.5 (18.6 to 49.1) |
| Total | 679 | 25 | 704 | 3.6 (2.3 to 5.2) |
| Rectal chlamydia positivity % (95% CI) | 4.0 (2.6 to 5.7) | 52.0 (31.3 to 72.2) | 5.7 (4.1 to 7.7) |
(McNemar’s test p = 0.02)
Each man is represented twice: once as a urethra and once as a rectum