Table 3 Univariate analysis of maternal health during pregnancy and preterm birth

Times of prenatal care visits

 <8

17

9.9

54

31.4

1

 ≥8

155

90.1

118

68.6

0.20

0.10-0.40

<0.001

Anxiety during pregnancy

 no

122

70.9

116

67.4

1

 yes

50

29.1

56

32.6

1.18

0.74-1.88

0.480

Reproductive tract infection during pregnancy

 no

124

72.1

110

64.0

1

 yes

48

27.9

62

36.0

1.52

0.93-2.47

0.092

Gestational Hypertension

 no

163

94.8

127

73.8

1

 yes

9

5.2

45

26.2

5.50

2.59-11.68

<0.001

Gestational diabetes mellitus

 no

155

90.1

146

84.9

1

 yes

17

9.9

26

15.1

1.64

0.85-3.19

0.143