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Table 4 Univariate analysis of maternal nutritional status 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 %
Balanced diet
 no 18 10.5 34 19.8 1   
 yes 154 89.5 138 80.2 0.43 0.22-0.84 0.014
Supplement folic acid during pregnancy
 <3 months 51 29.7 65 37.8 1   
 ≥3 months 121 70.3 107 62.2 0.64 0.39-1.06 0.083
Pre-pregnancy BMI (kg/m2) 20.8 ± 2.5 21.4 ± 2.9    
 <18.5 30 17.4 16 9.3 0.55 0.28-1.08 0.083
 18.5-23.9 122 70.9 117 68.0 1   
 ≥24 20 11.6 39 22.7 2.15 1.14-4.06 0.018
Gestational weight gain (kg) 17.0 ± 4.6 13.3 ± 5.0    
 normal growth (15.2 ± 1.1) 60 34.9 55 32.0 1   
 low growth (10.6 ± 2.2) 31 18.0 86 50.0 3.50 1.84-6.66 <0.001
 high growth (21.4 ± 3.5) 81 47.1 31 18.0 0.42 0.23-0.76 0.004
  1. Pre-pregnancy BMI (kg/m2) and gestational weight gain (kg) were also showed as Mean ± sd.