Table 1 The characteristics of spontaneous and induced labour groups for primiparas and multiparas
Primiparas n=43403 | Multiparas n=51648 | ||||||
|---|---|---|---|---|---|---|---|
Spontaneous (n=31 726, 73.1% of primiparas) | Induced (n=11 677, 26.9% of primiparas) | p-value* | Spontaneous (n=40 932, 79.3% of multiparas) | Induced (n=10 716, 20.7% of multiparas) | p-value* | ||
Mode of delivery | Mode of delivery | <0.001 | <0.001 | ||||
Vaginal | 70.7% | 54.7% | 91.0% | 83.7% | |||
Instrumental | 18.3% | 18.9% | 4.3% | 6.3% | |||
Urgent CS | 10.0% | 25.1% | 4.3% | 9.0% | |||
Emergency CS | 0.9% | 1.3% | 0.4% | 1.0% | |||
Maternal characteristics | Maternal age ≥30 | 48.3% | 54.7% | <0.001 | 70.8% | 71.6% | 0.099 |
BMI before pregnancy ≥30 | 6.6% | 14.4% | <0.001 | 9.7% | 21.0% | <0.001 | |
Gestational age ≥42 weeks | 2.8% | 23.6% | <0.001 | 1.6% | 15.3% | <0.001 | |
Prior caesarean section | 13.2% | 22.5% | <0.001 | ||||
Delivery characteristics | Partner support | 79.1% | 77.7% | 0.002 | 91.9% | 90.6% | <0.001 |
Use of epidural anesthesia | 75.4% | 75.6% | 0.673 | 57.4% | 70.3% | <0.001 | |
Prolonged labour | 11.7% | 18.4% | <0.001 | 4.1% | 7.1% | <0.001 | |
Birth weight | <0.001 | <0.001 | |||||
<3400g | 44.8% | 40.1% | 31.2% | 29.0% | |||
3400-3799 g | 34.1% | 31.2% | 35.4% | 30.4% | |||
3800-4199g | 16.2% | 20.6% | 23.9% | 26.7% | |||
≥4200g | 4.9% | 8.1% | 9.5% | 13.9% | |||