Table 6.
Labour and delivery outcomes by vaginal or caesarean section delivery and neonatal outcomes for all prolonged pregnancies (mixed parity) following IOL by maternal BMI category
| Underweight | Normal | Overweight | Obese | P value | |
|---|---|---|---|---|---|
| Pregnancy outcome by maternal BMI group (vaginal deliveries only n = 2351) | |||||
| Length stage 1 (hours) Median (IQR) | 4.8 (3.1–7.1) | 4.3 (2.6–6.9) | 4.1 (2.6–6.8) | 4.3 (2.4–7.2) | 0.424 |
| Length stage 2 (hours) Median (IQR) | 1.0 (0.5–1.9) | 0.9 (0.3–2.1) | 0.6 (0.3–1.6) | 0.5 (0.2–1.6) | <0.001* |
| Retained placenta, n, (%) | 0 (0.0) | 44 (4.1) | 22 (3.5) | 13 (2.7) | 0.042* |
| Second-degree tear, n (%) | 32 (20.3) | 213 (20.0) | 130 (20.4) | 135 (27.6) | 0.006* |
| Third-degree tear, n (%) | 5 (3.2) | 40 (3.8) | 22 (3.5) | 10 (2.0) | 0.363 |
| Episiotomy, n (%) | 42 (26.6) | 310 (29.1) | 152 (23.9) | 105 (21.4) | 0.007* |
| PPH (>500 ml), n (%) | 23 (14.6) | 182 (17.1) | 102 (16.0) | 74 (15.1) | 0.714 |
| PPH (>1000 ml), n (%) | 5 (3.2) | 32 (3.0) | 13 (2.0) | 18 (3.7) | 0.424 |
| Pregnancy outcome by maternal BMI group (caesarean section deliveries only, n = 725) | |||||
| PPH (>500 ml), n (%) | 25 (80.6) | 192 (77.1) | 199 (79.6) | 165 (84.6) | 0.268 |
| PPH (>1000 ml), n (%) | 1 (3.2) | 20 (8.0) | 25 (10.0) | 20 (10.3) | 0.533 |
| Neonatal outcome by maternal BMI group | |||||
| Macrosomia, n (%) (n = 2995) | 7 (3.8) | 55 (4.3) | 46 (5.3) | 53 (8.0) | 0.005* |
| Cord blood pH <7.2, n (%) (n = 2688) | 29 (17.9) | 276 (24.2) | 201 (25.8) | 141 (23.4) | 0.183 |
| Cord blood pH <7.0, n (%) (n = 2688) | 2 (1.2) | 6 (0.5) | 9 (1.2) | 7 (1.2) | 0.382 |
| Apgar <7 (5-minutes), n (%) (n = 3067) | 5 (2.6) | 16 (1.2) | 21 (2.4) | 8 (1.2) | 0.090 |
| Shoulder dystocia, n (%) (n = 3002) | 3 (1.6) | 32 (2.5) | 24 (2.8) | 18 (2.7) | 0.827 |
| Stillbirth, n (n = 3076) | 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.