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

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

  Control Case OR 95% CI P
n % n %
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