Characteristics | ≤750 g (n = 25) | 751-1000 g(n = 158) | 1001-1250 g(n = 369) | 1251-1500 g(n = 507) | Total(n = 1059) | F/χ2 | P | P value for trend |
---|---|---|---|---|---|---|---|---|
Male(n,%) | 13(52.0%) | 74(46.8%) | 214(57.9%) | 282(55.6%) | 583(55.1%) | 5.791 | 0.122 | 0.172 |
Gestational Age (weeks) | 27.2 ± 2.6 | 27.9 ± 2.0 | 29.5 ± 1.9 | 30.8 ± 2.0 | 29.8 ± 2.3 | 108.027 | 0.000 | 0.000 |
Birth Weight (g) | 686.0 ± 45.3 | 918.6 ± 69.5 | 1151.4 ± 71.4 | 1383.1 ± 69.7 | 1216.6 ± 198.0 | 2704.138 | 0.000 | 0.000 |
1 min Apgar score < 3(n,%) | 2(8.0%) | 9(5.7%) | 14(3.8%) | 0(0.0%) | 25(2.3%) | 17.296 | 0.001 | 0.000 |
5 min Apgar < 3(n,%) | 0(0.0%) | 2(1.3%) | 3(0.8%) | 1(0.2%) | 6(0.6) | 4.441 | 0.218 | 0.716 |
Cesarean section(n,%) | 12(23.1%) | 90(56.9%) | 176(47.7%) | 203(40.1%) | 481(45.4%) | 15.250 | 0.002 | 0.000 |