Risk of adverse pregnancy outcomes among women with chlamydia infection relative to those without the infection, Washington State 2003
| Chlamydia infection (n = 851) n (%) | No chlamydia infection (n = 3404) n (%) | RR* | 95% CI | |
|---|---|---|---|---|
| *Adjusted for maternal age and education. | ||||
| Birth weight (g) | ||||
| <2500 | 40 (4.7) | 114 (3.4) | 1.12 | 0.74 to 1.68 |
| 2500–3999 | 734 (86.6) | 2857 (84.1) | Ref | |
| >3999 | 74 (8.7) | 425 (12.5) | 0.81 | 0.61 to 1.07 |
| Premature rupture of membranes | ||||
| Yes | 49 (5.8) | 130 (3.8) | 1.50 | 1.03 to 2.17 |
| No | 800 (94.2) | 3248 (96.2) | Ref | |
| Gestational length (weeks) | ||||
| <37 | 76 (10.3) | 181 (6.1) | 1.46 | 1.08 to 1.99 |
| 37–41 | 542 (73.7) | 2426 (81.6) | Ref | |
| ⩾42 | 117 (15.9) | 365 (12.3) | 1.25 | 0.98 to 1.60 |
| Infant death | ||||
| Yes | 7 (0.8) | 15 (0.4) | 1.02 | 0.37 to 2.80 |
| No | 844 (99.2) | 3389 (99.6) | Ref | |