Table 7.
Labour and delivery outcomes by vaginal or caesarean section delivery and neonatal outcomes for all primiparous women with a prolonged pregnancy following IOL by maternal BMI category
| Underweight | Normal | Overweight | Obese | P value | |
|---|---|---|---|---|---|
| Pregnancy outcome by maternal BMI group (vaginal deliveries only n = 1447) | |||||
| Length stage 1 (hours) Median (IQR) | 5.3 (3.7–7.5) | 5.3 (3.5–8.0) | 5.5 (3.8–8.0) | 5.8 (3.5–8.5) | 0.630 |
| Length stage 2 (hours) Median (IQR) | 1.2 (0.6–2.0) | 1.4 (0.7–2.6) | 1.3 (0.6–2.3) | 1.3 (0.5–2.5) | 0.158 |
| Retained placenta, n (%) | 0 (0.0) | 25 (3.6) | 11 (3.1) | 6 (2.2) | 0.152 |
| Second-degree tear, n (%) | 26 (21.5) | 134 (19.3) | 86 (23.9) | 87 (32.1) | 0.001* |
| Third-degree tear, n (%) | 4 (3.3) | 37 (5.3) | 17 (4.7) | 7 (2.6) | 0.277 |
| Episiotomy, n (%) | 42 (34.7) | 271 (39.0) | 128 (35.6) | 93 (34.3) | 0.455 |
| PPH (>500 ml), n (%) | 22 (18.2) | 157 (22.6) | 78 (21.7) | 63 (23.2) | 0.701 |
| PPH (>1000 ml), n (%) | 5 (4.1) | 24 (3.5) | 10 (2.8) | 17 (6.3) | 0.127 |
| Pregnancy outcome by maternal BMI group (caesarean section deliveries only, n = 619) | |||||
| PPH (>500 ml), n (%) | 22 (78.6) | 169 (77.9) | 164 (80.0) | 145 (84.8) | 0.383 |
| PPH (>1000 ml), n (%) | 1 (3.6) | 17 (7.8) | 20 (9.8) | 15 (8.8) | 0.700 |
| Neonatal outcome by maternal BMI group | |||||
| Macrosomia, n (%) (n = 2016) | 3 (2.1) | 31 (3.5) | 22 (4.0) | 27 (6.3) | 0.052 |
| Cord blood pH <7.2, n (%) (n = 1810) | 28 (21.7) | 211 (26.8) | 161 (32.2) | 99 (25.2) | 0.031* |
| Cord blood pH <7.0, n (%) (n= 1810) | 2 (1.6) | 4 (0.5) | 7 (1.4) | 5 (1.3) | 0.328** |
| Apgar <7 (5-minutes), n (%) (n = 2063) | 5 (3.4) | 14 (1.5) | 17 (3.0) | 6 (1.4) | 0.105 |
| Shoulder dystocia, n (%) (n = 1999) | 2 (1.4) | 18 (2.0) | 11 (2.0) | 11 (2.6) | 0.827 |
| Stillbirth, n (n = 2066) | 0 | 0 | 1 | 1 | 0.538** |
PPH, postpartum haemorrhage.
Values are presented as medians and interquartile range (IQR) for lengths of labour or total counts (n) and percentages (%) for all other analyses. Values presented in bold with * indicate that the trend was significant (P< 0.05 by Kruskal–Wallis test or chi-square test).
**
Indicates loss of power.