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Table 4 Unadjusted and adjusted odds ratios for risk factors among women giving birth preterm compared to women giving birth at term

From: Effect of maternal stress during pregnancy on the risk for preterm birth

  Unadjusted OR   Adjusted OR****  
  OR 95 % CI P*** OR 95 % CI P***
Maternal stress during pregnancy 2.94 1.76–4.92 <0.000 2.15 1.18–3.92 0.012
Premature contractions 3.82 2.22–6.58 <0.000 2.73 1.48–5.03 0.001
Tobacco use 2.43 1.27–4.64 0.007 1.63 0.77–3.45 0.205
Previous preterm delivery 7.72 2.62–22.73 <0.000 6.15 1.95–19.44 0.002
Genital tract infection 3.74 1.89–7.38 <0.000 3.18 1.47–6.87 0.003
  1. OR, odds ratio, CI confidence interval
  2. ***P-value for Wald test
  3. ****Adjusted for maternal stress during pregnancy, premature contractions, tobacco use, previous preterm delivery and genital tract infection