Table 1.
Baseline characteristics of participations
| SVD n = 5030 |
NAD n = 22,608 |
χ2/Z | P value | |
|---|---|---|---|---|
| Age a | 32.00 (28.00,35.00) | 32.00 (29.00,35.00) | −2.889 | 0.004 |
| Gestational age (weeks)a | 39.57 (38.71,40.29) | 39.57 (38.71,40.29) | 0.614 | 0.539 |
| Graviditya | 2.00 (2.00,4.00) | 2.00 (1.00,3.00) | 15.750 | < 0.001 |
| Paritya | 1.00 (0.00,2.00) | 1.00 (0.00,1.00) | 25.976 | < 0.001 |
| Maternal height (cm) a | 162.60 (157.50,167.60) | 163.00 (160.00,168.00) | −5.915 | < 0.001 |
| Maternal BMI (kg/(m)2)a | 28.95 (26.08,32.53) | 29.21 (26.42,32.89) | −3.422 | 0.001 |
| Baby height (cm) a | 50.00 (48.30,52.00) | 50.50 (48.30,52.10) | −5.013 | < 0.001 |
| Baby weight (kg) a | 3.35 (3.04,3.65) | 3.35 (3.04,3.66) | −0.160 | 0.873 |
| Preterm deliveryb | 287 (5.7%) | 1261 (5.6%) | 0.128 | 0.721 |
| Multiple pregnancyb | 29 (0.6%) | 490 (2.2%) | 56.513 | < 0.001 |
| Inductionb | 810 (16.1%) | 7536 (33.0%) | 579.495 | < 0.001 |
| Oxytocinb | 949 (18.9%) | 12,513 (55.3%) | 2191.814 | < 0.001 |
| Operative deliveryb | 95 (1.9%) | 1744 (7.7%) | 224.805 | < 0.001 |
| Ethnicb | 195.759 | < 0.001 | ||
| White | 2820 (56.1%) | 14,968 (66.2%) | ||
| Black | 597 (11.9%) | 1818 (8.0%) | ||
| others | 1613 (32.1%) | 5822 (25.8%) |
Data presented as n (%) or median (interquartile range); SVD Spontaneous Vaginal Delivery; NAD Neuroaxial Analgesia Delivery
aThe non-normal distribution continuous data were presented as median (interquartile range), the data were compared using Mann-Whitney U test (Z)
bThe categorical data were presented as numbers (frequencies, %), Chi-square test was used for categorical data (χ2)