Table 6.
Clustering of postpartum haemorrhage after vaginal delivery. Figures are pairwise odds ratios (POR) and 95% confidence interval
| Cluster level | All vaginal deliveries | Vaginal deliveries-complete case | ||||
|---|---|---|---|---|---|---|
| No of pairwise correlations | Crude POR (95% CI) | No of pairwise correlations | Crude POR (95% CI) | Adjusted* POR (95% CI) | ||
| Couples | 116 552 | 4.54 (4.20 to 4.91) | 91 462 | 4.75 (4.35 to 5.19) | 4.28 (3.90 to 4.70) | |
| Mothers, new partner | 21 090 | 3.64 (2.93 to 4.51) | 18 335 | 3.35 (2.63 to 4.26) | 3.03 (2.37 to 3.89) | |
| Fathers, new partner | 16 236 | 0.97 (0.69 to 1.37) | 13 921 | 1.03 (0.71 to 1.48) | 1.00 (0.69 to 1.45) | |
| Sisters | 63 352 | 1.58 (1.34 to 1.87) | 49 828 | 1.55 (1.27 to 1.88) | 1.46 (1.20 to 1.78) | |
| Brothers | 57 332 | 1.27 (1.05 to 1.53) | 45 072 | 1.21 (0.96 to 1.51) | 1.17 (0.93 to 1.48) | |
| Mixed siblings | 112 420 | 1.03 (0.89 to 1.19) | 88 024 | 1.05 (0.89 to 1.24) | 1.03 (0.87 to 1.22) | |
*Adjusted includes birth year, maternal age, parity, interval between pregnancies, height, BMI, induction, labour, complications, post-term birth, and high birth weight.