Table 1 Demographic and clinical characteristics of the case and control groups

Age (years)

30.09 ± 5.65

30.31 ± 4.01

− 1.478

0.140

Age of menarche (years)

13.98 ± 1.19

14.02 ± 1.20

− 0.984

0.325

Number of abortion

0.62 ± 0.95

0.62 ± 0.86

− 0.102

0.919

Gestational age at admission (weeks)

35.56 ± 3.48

39.16 ± 1.35

− 43.19

0.000*

Gestational age at delivery (weeks)

36.21 ± 3.09

39.36 ± 1.22

− 41.25

0.000*

Fetal birth weight (g)

2600 ± 934

3387 ± 673

− 30.66

0.000*

Systolic blood pressure (mmHg)

160.05 ± 18.51

115.88 ± 10.56

95.73

0.000*

Diastolic blood pressure (mmHg)

104.12 ± 13.63

73.47 ± 7.32

91.24

0.000*

White blood cell (WBC)

9.61 ± 2.84

8.96 ± 2.41

8.26

0.000*

Triglyceride

3.88 ± 1.83

2.94 ± 1.25

11.85

0.000*

Cholesterol (CHO)

3.89 ± 1.87

6.11 ± 1.23

− 27.88

0.000*

Blood urea nitrogen (BUN)

4.67 ± 1.98

3.18 ± 0.98

28.80

0.000*

Creatinine (CREA)

65.26 ± 27.60

51.46 ± 19.66

17.45

0.000*