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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