Table 1 Maternal and peripartum characteristics between 4 groups

Maternal age, year

33(30,37)

33(29,37)

33(29,37)

33(30,37)

0.713

Assisted reproductive technology

102(10.3)

47(8.4)

7(7.0)

14(5.2)

0.052

Cesarean section

955(96.8)

522(93.2)

93(93.0)

235(87.0)

<0.001

Classification of hypertension

0.006

 Chronic hypertension

90(9.1)

61(10.9)

10(10.0)

24(8.9)

 Gestational hypertension

166(16.8)

136(24.3)

28(28.0)

66(24.4)

Preeclampsia

665(67.4)

315(56.3)

54(54.0)

160(59.3)

Eclampsia

31(3.1)

21(3.8)

3(3.0)

10(3.7)

HELLP syndrome

35(3.5)

27(4.8)

5(5.0)

10(3.7)

PPROM

88(8.9)

71(12.7)

9(9.0)

2(8.1)

0.074

Chorioamnionitis

24(2.4)

15(2.7)

3(3.0)

1(0.4)

0.156

Gestational Age, wk

30(29,31)

30(29,31)

30(29,31)

30(29,31)

0.463

Birth weight (g), mean (SD)

1190(1000,1370)

1200(1000,1423)

1245(1100,1450)

1250(1050,1430)

0.007

Birth weight z-scores

−0.105(−0.549,0.404)

−0.004(−0.546,0.537)

0.144(−0.421,0.539)

0.005(−0.9,0.677)

0.026

Birth head circumference, cm

27(25.5,28)

27(25,28.5)

27(26,29)

27(26,29)

0.434

Male gender

496(50.3)

30(53.8)

43(43.0)

141(52.2)

0.202

Multiples

145(14.7)

74(13.2)

15(15.0)

23(8.5)

0.066

Inborn

974(98.7)

548(97.9)

100(100.0)

243(90.0)

<0.001

Apgar <7 at 5 min

98(9.9)

81(14.5)

10(10.0)

51(18.9)

<0.001

SNAPPE-II

13(5,27)

14(5,30)

13(0,27.8)

14(5,28)

0.167