Table 1 Comparison of general characteristics between different divided groups

age (years)

30.74 ± 3.22

33.43 ± 4.26

0.000

32.11 ± 4.03

32.53 ± 4.09

0.281

Gravidity (n)

1.61 ± 0.86

1.99 ± 1.30

0.000

1.79 ± 1.13

1.90 ± 1.15

0.284

Parity (n)

1.19 ± 0.41

1.25 ± 0.49

0.097

1.21 ± 0.45

1.28 ± 0.48

0.101

Weight before pregnancy (kg)

55.55 ± 8.04

58.38 ± 9.71

0.000

57.17 ± 9.09

56.94 ± 9.16

0.792

Weight before delivery (kg)

69.18 ± 9.07

72.18 ± 10.41

0.000

71.04 ± 9.94

70.23 ± 9.95

0.400

Gain weight during pregnancy (kg)

13.62 ± 4.82

13.80 ± 4.78

0.670

13.87 ± 4.66

13.29 ± 5.38

0.252

BMI before pregnancy (kg/m²)

21.22 ± 2.71

22.50 ± 3.48

0.000

22.00 ± 3.19

21.74 ± 3.32

0.403

BMI before delivery (kg/m²)

26.43 ± 2.98

27.81 ± 3.69

0.000

27.32 ± 3.39

26.82 ± 3.63

0.129

Neonatal birth weight(g)

3388.06 ± 427.41

3249.46 ± 629.66

0.002

3345.09 ± 525.30

3218.18 ± 612.55

0.017

Gestational age at delivery (weeks)

39.17 ± 1.30

38.31 ± 2.33

0.000

38.81 ± 1.85

38.39 ± 2.27

0.029