Table 2.
neonatal characteristics of the study population.
| Characteristic | 24–27 weeks (n = 148) | 28–31 weeks (n = 1612) | 32–33 weeks (n = 2460) | 34–36 weeks (n = 9481) | Total (N = 13701) | F/χ2 | p |
|---|---|---|---|---|---|---|---|
| Male[n (%)] | 88 (59.5) | 913 (56.6) | 1398 (56.8) | 5247 (55.3) | 7646 (55.8) | 3.124 | 0.373 |
| GA*,mean (SD), wk | 26.6 (1.1) | 30.4 (1.1) | 33.0 (0.6) | 35.6 (0.9) | 34.4 (2.2) | 24625.8 | 0.000 |
| BW#, mean (SD), g | 949.9 (287.1) | 1470.8 (334.9) | 1930.5 (373.7) | 2486.7 ()458.7 | 2250.7 (575.7) | 3631.2 | 0.000 |
| Cesarean delivery[n (%)] | 24 (16.2) | 683 (42.4) | 1412 (57.4) | 6079 (64.1) | 8198 (59.8) | 400.206 | 0.000 |
| Multiple birth[n (%)] | 56 (37.8) | 458 (28.4) | 767 (31.2) | 3254 (34.3) | 4535 (33.1) | 27.986 | 0.000 |
| Neonatal asphyxia[n (%)] | 93 (62.8) | 543 (34.8) | 408 (17.2) | 606 (6.7) | 1650 (12.6) | 1365.210 | 0.000 |
*GA: gestational age, #BW:birth weight.