Multivariable conditional logistic regression analysis using duration of ruptured membranes of 18 h*
| Odds ratio (95% CI) | p Value | |
| Group B streptococcus carrier | ||
| Yes | 6.88 (2.77 to 17.1) | <0.001 |
| No | ||
| Maternal infection | ||
| Yes | 4.17 (1.12 to 15.4) | 0.029 |
| No | ||
| Maximum intrapartum temperature | 2.16 per °C (1.32 to 3.53) | 0.001 |
| Duration of ruptured membranes | ||
| <18 h | 0.054 | |
| ⩾18 h | 1.82 (0.99 to 3.35) | |
| Fetal tachycardia | ||
| Yes | 1.86 (0.96 to 3.35) | 0.065 |
| No |
*Adjusted for age, categorised as younger or older than 20 years of age and postdelivery antibiotics for mother.