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Table 3 Association between maternal systemic/localized comorbidity and preterm birth (PTB) by clinical subtype

From: Association between maternal comorbidity and preterm birth by severity and clinical subtype: retrospective cohort study

  Unadjusted OR (95% CI) Adjusted OR (95% CI)* Population attributable fraction
All PTB    
   Systemic comorbidity 1.67 (1.64-1.69) 1.66 (1.63-1.68) 12.8
   Localized comorbidity 2.23 (2.20-2.27) 2.27 (2.24-2.31) 16.9
Medically indicated PTB    
   Systemic comorbidity 4.11 (4.00-4.22) 4.01 (3.90-4.11) 21.8
   Localized comorbidity 4.88 (4.76-5.01) 4.83 (4.71-4.96) 23.3
PPROM    
   Systemic comorbidity 1.23 (1.19-1.26) 1.18 (1.15-1.22) 8.0
   Localized comorbidity 1.85 (1.80-1.90) 1.83 (1.78-1.88) 21.1
Spontaneous PTB    
   Systemic comorbidity 0.99 (0.97-1.02) 1.00 (0.97-1.02) 0
   Localized comorbidity 1.31 (1.28-1.35) 1.38 (1.34-1.42) 5.8
  1. * Odds ratio (OR), 95% confidence interval (CI) adjusted for maternal age, grand multiparity, and period
  2. † Preterm premature rupture of membranes
  3. ‡ Spontaneous preterm labour before 37 weeks of gestation with intact membranes