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Table 5 Independent risk factors of obstetric haemorrhage and C-statistics

From: Use of hospitalisation history (lookback) to determine prevalence of chronic diseases: impact on modelling of risk factors for haemorrhage in pregnancy

  Model 1* (n = 53,191): Model 2**(n = 53,191):
   Covariates: OR (95%CI) P OR (95%CI) P
Chronic renal diseases (yes) 2.85 (1.58-5.12) <0.001 1.63 (1.11-2.40) 0.01
Psychiatric disorders (yes) 1.48 (1.08-2.02) 0.01 1.38 (1.04-1.84) 0.03
Baby's gender (female) 1.15 (1.09-1.22) <0.001 1.15 (1.09-1.22) <0.001
Birth weight (per 100 g) 1.05 (1.05-1.06) <0.001 1.05 (1.05-1.06) <0.001
Multiple births (yes) 2.28 (1.86-2.78) <0.001 2.27 (1.86-2.78) <0.001
Gestational age   <0.001   <0.001
   Preterm (20 - 36 weeks) 2.11 (1.85-2.40)   2.12 (1.86-2.41)  
   Term (37 - 41 weeks) 1.00   1.00  
   Postterm (≥42 weeks) 0.99 (0.82-1.19)   0.99 (0.82-1.20)  
Maternal age   0.11   0.10
   <20 years 1.03 (0.92-1.15)   1.02 (0.91-1.15)  
   20 - 34 years 1.00   1.00  
   ≥35 years 1.10 (1.01-1.19)   1.10 (1.01-1.19)  
Onset of labor + mode of delivery   <0.001   <0.001
   Elective CS^ (no labor) 1.07 (0.96-1.20)   1.08 (0.96-1.20)  
   Emergency CS + induction/augmentation 0.87 (0.78-0.98)   0.88 (0.78-0.98)  
   Instrumental + induction/augmentation 1.99 (1.81-2.19)   1.99 (1.82-2.19)  
   Vaginal + induction/augmentation 1.43 (1.31-1.56)   1.43 (1.31-1.56)  
   Emergency CS (spontaneous labor) 0.77 (0.67-0.90)   0.77 (0.67-0.90)  
   Instrumental (spontaneous labor) 1.58 (1.40-1.77)   1.58 (1.41-1.77)  
   Vaginal (spontaneous labor) 1.00   1.00  
Type of hospital (tertiary vs. other) 1.54 (1.45-1.64) <0.001 1.54 (1.45-1.64) <0.001
  C-statistic (95% CI) C-statistic (95% CI)
Predictive ability 0.6240 (0.6157-0.6322) 0.6238 (0.6156-0.6320)
P for comparing the two correlated C statistics: 0.61
  1. * Using 'Birth' records
  2. ** Using 'Pregnancy' records
  3. ^ Cesarean section