Logistic regression analysis of factors associated with intubation
| Significance | Odds ratio (95% CI) | |
|---|---|---|
| *Three month increments from start of study period. | ||
| †Effect of one week incremental increase in gestational age. | ||
| ‡Relative to normal vaginal delivery in which crude intubation rate 0.6%. | ||
| T-piece era v baseline era | 0.9 (NS) | 1.03 (0.58 to 1.80) |
| Time trend* | 0.016 | 0.93 (0.87 to 0.99) |
| Increasing gestational age† | <0.0001 | 0.66 (0.61 to 0.71) |
| Neville Barnes’ forceps‡ | <0.001 | 4.39 (2.06 to 9.36) |
| Kielland’s forceps‡ | <0.01 | 11.9 (2.56 to 55.67) |
| Ventouse extraction‡ | <0.001 | 4.49 (2.16 to 9.31) |
| Vaginal breech delivery‡ | <0.0001 | 9.43 (4.85 to 18.34) |
| Elective caesarean | 0.58 (N.S.) | 1.21 (0.61 to 2.4) |
| Emergency caesarean‡ | <0.0001 | 7.14 (5.05 to 10.12) |
| Meconium vaginal delivery‡ | <0.0001 | 5.39 (2.69 to 10.77) |