Maternal age, years | <20 | 20-34 | ≥35 | P values |
---|---|---|---|---|
Live births, n (%)a | 1,490 (2.5) | 53,654 (89.1) | 5,065 (8.4) | Â |
Males | 761 (51.2) | 28,667 (53.7) | 2,763 (54.8) | 0.054 |
Gestational age (weeks) | 39.7±1.7 | 39.7±1.5 | 39.4±1.7 | <0.001 |
Birthweight (grams) | 3,329±478 | 3,442±485 | 3,465±552 | <0.001 |
Preterm birth rate | 74 (5.0) | 1,847 (3.5) | 307 (6.1) | <0.001 |
Low birthweight | 56 (3.8) | 1,406 (2.6) | 214 (4.2) | <0.001 |
Multi-births | 18 (1.2) | 939 (1.8) | 121 (2.4) | 0.001 |
Congenital anomalies | 5 (0.3) | 273 (0.5) | 33 (0.7) | 0.245 |
Cesarean section rate | 672 (45.1) | 28,141 (52.6) | 2,948 (58.3) | <0.001 |
Pregnancy complications | 138 (9.3) | 5,162 (9.6) | 717 (14.2) | <0.001 |
Hypertension | 15 (1.0) | 795 (1.5) | 200 (3.9) | <0.001 |
PROM | 75 (5.0) | 2,920 (5.4) | 280 (5.5) | 0.757 |
Anemia | 17 (1.1) | 637 (1.2) | 89 (1.8) | 0.002 |
Maternal age (years) | 18.6±0.6 | 24.9±3.6 | 38.0±2.5 | <0.001 |
>9 years’ education | 62 (4.4) | 9,827 (19.7) | 401 (8.5) | <0.001 |
Amniotic fluid volume | Â | Â | Â | 0.005 |
Normal | 1,344 (92.0) | 48,608 (92.6) | 4,568 (92.3) | Â |
Polyhydramnios | 16 (1.1) | 396 (0.7) | 61 (1.2) | Â |
Oligohydramnios | 101 (6.9) | 3,490 (6.6) | 318 (6.4) | Â |
Amniotic contamination | Â | Â | Â | <0.001 |
Normal | 1,245 (84.1) | 45,731 (86.0) | 4,245 (84.6) | Â |
Grade I | 93 (6.3) | 2,843 (5.3) | 267 (5.3) | Â |
Grade II | 84 (5.7) | 2,412 (4.5) | 234 (4.7) | Â |
Grade III | 58 (3.9) | 2,196 (4.1) | 269 (5.4) | Â |
Apgar score | Â | Â | Â | Â |
1-min ≤7 | 69 (4.6) | 1,961 (3.7) | 249 (4.9) | <0.001 |
1-min ≤3 | 14 (0.9) | 280 (0.5) | 52 (1.0) | <0.001 |
5-min ≤7 | 22 (1.5) | 443 (0.8) | 73 (1.5) | <0.001 |
5-min ≤3 | 13 (0.9) | 181 (0.3) | 40 (0.8) | <0.001 |
Deathsb | 10 (0.7) | 203 (0.4) | 34 (0.7) | 0.002 |