Gestational age (weeks) | <32 | 32-36 | 37-41 | ≥42 | P values |
---|---|---|---|---|---|
All birthsa | 302 (0.5) | 1,937 (3.2) | 56,331 (93.5) | 1,694 (2.8) | Â |
Males | 164 (54.8) | 1,076 (56.0) | 30,134 (53.8) | 838 (49.7) | 0.002 |
Gestational age (weeks) | 29.8±1.8 | 35.3±1.3 | 39.8±1.0 | 42.4±0.5 | <0.001 |
Birthweight (g) | 1,727±709 | 2,572±562 | 3,475±442 | 3,596±443 | <0.001 |
Low birthweight | 258 (85.4) | 844 (43.8) | 572 (1.0) | 6 (0.4) | <0.001 |
Multi-births | 37 (12.3) | 334 (17.2) | 705 (1.3) | 9 (0.5) | <0.001 |
Congenital anomalies | 25 (8.4) | 38 (2.0) | 243 (0.4) | 7 (0.4) | <0.001 |
Cesarean section | 73 (24.6) | 960 (49.8) | 29,697 (52.8) | 1,082 (64.0) | <0.001 |
Pregnancy complications | 101 (34.0) | 759 (39.3) | 5,086 (9.1) | 90 (5.3) | <0.001 |
Hypertension | 12 (4.0) | 127 (6.6) | 855 (1.5) | 17 (1.0) | <0.001 |
PROM | 54 (17.9) | 427 (22.0) | 2761 (4.9) | 40 (2.4) | <0.001 |
Anemia | 4 (1.3) | 60 (3.1) | 667 (1.2) | 14 (0.8) | <0.001 |
Maternal age (years) | 26.9±6.3 | 26.7±5.9 | 25.8±5.1 | 25.1±5.0 | <0.001 |
Delayed childbearing | 45 (15.0) | 262 (13.6) | 4,601 (8.2) | 125 (7.4) | <0.001 |
>9 years’ education | 41 (15.4) | 364 (21.4) | 9,732 (18.6) | 171 (10.8) | <0.001 |
Amniotic fluid volume | Â | Â | Â | Â | <0.001 |
Normal | 242 (84.6) | 1,651 (90.1) | 51,189 (92.8) | 1,484 (89.3) | Â |
Polyhydramnios | 17 (5.9) | 35 (1.9) | 410 (0.7) | 10 (0.6) | Â |
Oligohydramnios | 27 (9.4) | 147 (8.0) | 3,561 (6.5) | 168 (10.1) | Â |
Amniotic contamination | Â | Â | Â | Â | <0.001 |
Normal | 239 (81.3) | 1,679 (89.3) | 48,041 (86.0) | 1,295 (77.1) | Â |
Grade I | 15 (5.1) | 70 (3.7) | 2,986 (5.3) | 140 (8.3) | Â |
Grade II | 5 (5.1) | 56 (3.0) | 2,543 (4.6) | 121 (7.2) | Â |
Grade III | 25 (8.5) | 75 (4.0) | 2,305 (4.1) | 124 (7.4) | Â |
1-min Apgar ≤7 | 187 (64.5) | 463 (24.3) | 1,561 (2.8) | 62 (3.7) | <0.001 |
1-min Apgar ≤3 | 98 (33.8) | 99 (5.2) | 143 (0.3) | 5 (0.3) | <0.001 |
5-min Apgar ≤7 | 152 (52.4) | 179 (9.4) | 198 (0.4) | 8 (0.5) | <0.001 |
5-min Apgar ≤3 | 80 (27.6) | 75 (3.9) | 72 (0.1) | 4 (0.2) | <0.001 |
Hospitalized rate | 208 (68.9) | 1,445 (74.6) | 4,961 (8.8) | 123 (7.3) | <0.001 |
Oxygen therapy | 156 (51.7) | 656 (33.9) | 966 (1.7) | 36 (2.1) | <0.001 |
Mechanical ventilation | 111 (36.8) | 253 (13.1) | 206 (0.4) | 9 (0.5) | <0.001 |
Surfactant therapy | 33 (10.9) | 49 (2.5) | 8 (0) | 0 (0) | <0.001 |
Pneumonia | 167 (55.3) | 1,064 (54.9) | 2,494 (4.4) | 69 (4.1) | <0.001 |
Asphyxia | 59 (19.5) | 232 (12.0) | 493 (0.9) | 16 (0.9) | <0.001 |
RDS | 92 (30.5) | 183 (9.4) | 90 (0.2) | 0 (0) | <0.001 |
Deathsb | 93 (30.9) | 76 (4.0) | 73 (0.1) | 4 (0.2) | <0.001 |