Birthweight (g) | <1,500 | 1,500-2,499 | 2,500-3,999 | ≥4,000 | P values |
---|---|---|---|---|---|
Birth number (%) | 154 (0.3) | 1,537 (2.5) | 50,450 (83.6) | 8,231 (13.6) | Â |
Males | 73 (48.0) | 762 (49.9) | 26,133 (52.0) | 5,343 (65.3) | <0.001 |
Gestational age (weeks) | 30.1±2.9 | 35.9±2.9 | 39.7±1.2 | 40.2±1.0 | <0.001 |
Birthweight (grams) | 1,157±238 | 2,140±269 | 3,365±333 | 4,192±250 | <0.001 |
Preterm births | 152 (98.7) | 950 (62.3) | 1,103 (2.2) | 26 (0.3) | <0.001 |
Multi-births | 28 (18.2) | 323 (21.0) | 729 (1.4) | 23 (0.3) | <0.001 |
Congenital anomalies | 11 (7.1) | 54 (3.5) | 222 (0.4) | 27 (0.3) | <0.001 |
Cesarean section rate | 43 (28.3) | 748 (49.0) | 25,629 (50.9) | 5,438 (66.2) | <0.001 |
Pregnancy complications | 65 (42.2) | 476 (31.0) | 4,769 (9.4) | 710 (8.6) | <0.001 |
Hypertension | 12 (7.8) | 105 (6.8) | 758 (1.5) | 133 (1.6) | <0.001 |
PROM | 25 (16.2) | 236 (15.4) | 2,678 (5.3) | 336 (4.1) | <0.001 |
Anemia | 3 (1.9) | 40 (2.6) | 590 (1.2) | 110 (1.3) | <0.001 |
Maternal age (years) | 26.6±6.3 | 26.3±5.9 | 25.7±5.1 | 26.7±5.3 | <0.001 |
Delayed childbearing | 22 (14.5) | 192 (12.6) | 3,971 (7.9) | 866 (10.6) | <0.001 |
>9 years’ education | 15 (10.9) | 256 (18.7) | 8,614 (18.4) | 1,397 (18.3) | 0.151 |
Amniotic fluid volume | Â | Â | Â | Â | <0.001 |
Normal | 123 (83.7) | 1,273 (86.9) | 45,686 (92.5) | 7,608 (94.5) | Â |
Polyhydramnios | 11 (7.5) | 27 (1.8) | 331 (0.7) | 105 (1.3) | Â |
Oligohydramnios | 13 (8.8) | 165 (11.3) | 3,395 (6.9) | 342 (4.2) | Â |
Amniotic contamination | Â | Â | Â | Â | <0.001 |
Normal | 121 (80.1) | 1,259 (84.3) | 43,144 (86.2) | 6,841 (83.9) | Â |
Grade I | 10 (6.6) | 62 (4.1) | 2,616 (5.2) | 533 (6.5) | Â |
GradeII | 4 (2.6) | 68 (4.5) | 2,273 (4.5) | 391 (4.8) | Â |
Grade III | 16 (10.6) | 104 (7.0) | 2,022 (4.0) | 388 (4.8) | Â |
Apgar score | Â | Â | Â | Â | Â |
1-min ≤7 | 107 (74.3) | 449 (29.7) | 1,509 (3.0) | 212 (2.6) | <0.001 |
1-min ≤3 | 59 (41.0) | 115 (7.6) | 153 (0.3) | 17 (0.2) | <0.001 |
5-min ≤7 | 91 (63.6) | 209 (13.9) | 209 (0.4) | 27 (0.3) | <0.001 |
5-min ≤3 | 45 (31.5) | 88 (5.8) | 89 (0.2) | 12 (0.1) | <0.001 |
Hospitalization | 121 (78.6) | 1,209 (78.7) | 4,880 (9.7) | 637 (7.7) | <0.001 |
Oxygen therapy | 103 (66.9) | 565 (36.8) | 1,043 (2.1) | 122 (1.5) | <0.001 |
Mechanical ventilation | 67 (43.5) | 246 (16.0) | 255 (0.5) | 23 (0.3) | <0.001 |
Postnatal steroids | 10 (6.5) | 71 (4.6) | 488 (1.0) | 72 (0.9) | <0.001 |
Surfactant therapy | 18 (11.7) | 57 (3.7) | 14 | 1 | <0.001 |
Pneumonia | 88 (57.1) | 910 (59.2) | 2,532 (5.0) | 326 (4.0) | <0.001 |
Asphyxia | 31 (20.1) | 214 (13.9) | 504 (1.0) | 59 (0.7) | <0.001 |
RDS | 56 (36.4) | 178 (11.6) | 132 (0.3) | 4 | <0.001 |
IVH | 50 (32.5) | 468 (30.4) | 670 (1.3) | 62 (0.8) | <0.001 |
Hyperbilirubinemia | 7 (4.5) | 120 (7.8) | 1448 (2.9) | 202 (2.5) | <0.001 |
Deathsa | 55 (35.7) | 93 (6.1) | 88 (0.2) | 10 (0.1) | <0.001 |