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Table 5 Multivariate analysis for related factors of preterm birth

From: A matched case–control study of preterm birth in one hospital in Beijing, China

Related factors

β

Waldsχ2

OR

95% CI

P

University or graduate education

0.097

0.050

1.10

0.47-2.57

0.823

Family income <1000 dollars per month

0.386

0.875

1.47

0.66-3.31

0.350

Family living space <20 m2 per person

−0.234

0.254

0.79

0.32-1.97

0.614

Prenatal care visits ≥ 8 times

−1.852

12.458

0.16

0.06-0.44

<0.001

Anxiety during pregnancy

0.482

1.784

1.62

0.80-3.28

0.182

Reproductive tract infection during pregnancy

0.602

2.758

1.83

0.90-3.72

0.097

Gestational hypertension

2.040

15.349

7.69

2.77-21.32

<0.001

Gestational diabetes mellitus

0.2110

0.180

1.24

0.47-3.27

0.671

Balanced diet

−1.023

4.717

0.36

0.14-0.91

0.030

Supplement folic acid ≥3 months during pregnancy

−0.162

0.197

0.85

0.42-1.74

0.657

Pre-pregnancy BMI <18.5 kg/m2

0.145

0.086

1.16

0.44-3.05

0.769

Pre-pregnancy BMI ≥24 kg/m2

0.362

0.632

1.44

0.59-3.50

0.427

Low growth weight gain

1.104

7.402

3.02

1.36-6.68

0.007

High growth weight gain

−0.886

4.226

0.41

0.18-0.96

0.040