Table 1. Maternal and neonatal clinical characteristics of single-gestation infants born through vaginal delivery from 37 weeks 0 days to 41 weeks 6 days.
| Characteristics | |
|---|---|
| Maternal characteristics | |
| Age at delivery, mean (range), years | 29.5 (16–46) |
| Highest level of education attained, n (%) | |
| Junior high school and below | 3546 (33.6) |
| Senior high school | 1917 (18.2) |
| College and higher | 5087 (48.2) |
| BMI during the week before delivery, mean (SD), kg/m2 | 26.3 (3.0) |
| Gestational age, mean (SD), weeks | 39.5 (1.1) |
| Parity, n (%) | |
| 1 | 4938 (46.8) |
| ≥2 | 5612 (53.2) |
| Pathological obstetrics, n (%) | |
| No | 5243 (49.7) |
| Yes | 5307 (50.3) |
| Hb level during the week before delivery, n (%), g/L | |
| <110 | 3058 (29.0) |
| ≥110 | 7492 (71.0) |
| First stage of labor, mean (SD), h | 6.2 (3.5) |
| Second stage of labor, mean (SD), min | 28.3 (28.2) |
| Forceps delivery or vacuum extraction, n (%) | |
| No | 10,136 (96.1) |
| Yes | 414 (3.9) |
| Neonatal characteristics | |
| Weight, mean (SD), g | 3245.7 (364.0) |
| Sex, n (%) | |
| Male | 5747 (54.5) |
| Female | 4803 (45.5) |
| MSAF, n (%) | |
| No | 7960 (75.5) |
| Yes | 2590 (24.5) |
| Admission to the neonatology department | 1535 (14.5) |
| Mortality | 0 (0) |
BMI: body mass index; Hb: hemoglobin; MSAF: meconium-stained amniotic fluid.