Table 3 Neonatal outcomes of 4 groups

birth weight, median(P₂₅-P₇₅)

2320

(2050,2560)a

2330

(2060,2560)a

2210

(1940,2440)b

1980

(1760,2260)c

low birth weight infants(< 2500 g), n(%)

585(69.5%)a

523(67.9%)a

452(80.0%)b

76(92.7%)c

very low birth weight(< 1500 g), n(%)

45(5.3%)a

17(2.2%)b

41(7.3%)a

10(12.2%)a

extremely low birth weight(< 1000 g), n(%)

11(1.3%)a

1(0.1%)b

3(0.5%)a, b

1(1.2%)a, b

amniotic fluid

62(7.4%)a

101(13.1%)b

138(24.5%)c

20(24.4%)c

Apgar score ≤ 7 at 1 min, n(%)

37(4,4%)

25(3.2%)

31(5.5%)

7(8.5%)

Apgar score ≤ 7 at 5 min, n(%)

11(1.3%)

5(0.6%)

9(1.6%)

1(1.2%)