Table 5 Independent risk factors of obstetric haemorrhage and C-statistics
| Â | 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 | Â | <0.001 | Â | <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 | Â | 0.11 | Â | 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 | Â | <0.001 | Â | <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 |
| Â | 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 | ||||