Table 3

Temporal Trends in atonic postpartum hemorrhage by maternal, fetal and obstetrical characteristics, British Columbia, 2000-2009
All years Rate per 100 deliveries 2009 vs. 2000 P for trend2
n1 rate 2000 2001 2008 2009 RR 95% CI
Parity
 Nulliparous 12,237 6.5 5.5 5.5 8.1 7.6 1.39 1.29-1.51 <0.001
 Parous 9,863 4.4 4.2 4.2 5.3 5.2 1.24 1.14-1.35 <0.001
Maternal age (years)
 <20 953 6.2 6.1 5.0 8.5 7.6 1.26 0.97-1.62 <0.001
 20-34 16,641 5.4 4.8 4.8 6.6 6.4 1.34 1.26-1.43 <0.001
 ≥35 4,506 5.2 4.4 4.7 6.3 5.9 1.34 1.18-1.53 <0.001
BMI
 Underweight 1,032 6.0 4.8 5.2 7.4 6.8 1.43 1.09-1.87 <0.001
 Normal 9,960 5.7 5.1 5.1 6.9 6.8 1.33 1.22-1.47 <0.001
 Overweight 2,977 5.1 4.5 4.5 6.2 6.2 1.39 1.19-1.62 <0.001
 Obese 1,583 4.9 4.2 4.4 6.4 5.5 1.31 1.06-1.63 <0.001
Plurality
 Singleton 21,529 5.3 4.7 4.7 6.5 6.3 1.33 1.25-1.41 <0.001
 Multiple 571 9.2 7.1 10.8 11.3 9.4 1.33 0.91-1.95 <0.001
Birthweight (grams)
 <2500 794 3.7 3.2 4.0 5.0 3.7 1.17 0.85-1.61 0.03
 2500-3999 17,353 5.2 4.5 4.5 6.3 6.2 1.37 1.29-1.47 <0.001
 ≥4000 3,939 7.2 6.6 6.4 9.1 8.2 1.24 1.09-1.41 <0.001
Gestational age (weeks)
 <28 68 2.0 2.14 0.69 3.13 1.5 0.71 0.25-2.01 0.53
 28-36 1,477 4.5 3.3 4.2 6.0 5.2 1.55 1.21-1.97 <0.001
 37-41 20,115 5.5 4.9 4.8 6.7 6.5 1.33 1.25-1.41 <0.001
 ≥42 396 6.2 5.8 5.3 6.9 5.9 1.03 0.68-1.57 0.52
Vaginal delivery
 Spontaneous 14,400 5.8 5.1 5.2 7.1 6.8 1.33 1.24-1.42 <0.001
 Instrumental 5,141 11.5 8.9 10.3 14.6 14.2 1.59 1.42-1.79 <0.001
Cesarean delivery
 No labour 912 1.7 1.6 1.3 2.1 2.1 1.28 0.94-1.73 <0.001
 With labour, no induction 1,001 2.4 1.6 1.5 3.5 3.0 1.92 1.43-2.58 <0.001
 With induction 646 2.9 1.9 1.5 3.9 3.5 1.74 1.20-2.54 <0.001
Previous cesarean
 Yes 1,426 2.5 2.7 2.3 3.2 2.9 1.08 0.86-1.34 0.001
 No 20,674 5.8 5.1 5.1 7.2 6.9 1.37 1.30-1.46 <0.001
Induction of labour
 Yes 5,648 6.4 5.4 5.4 8.4 7.7 1.41 1.26-1.58 <0.001
 No 16,452 5.1 4.6 4.6 6.1 6.0 1.31 1.22-1.40 <0.001
Augmentation of labour (oxytocin)
 Yes 4,561 7.2 5.7 6.1 8.9 8.1 1.41 1.24-1.61 <0.001
 No 17,539 5.0 4.6 4.5 6.1 6.0 1.31 1.23-1.39 <0.001
Epidural analgesia
 Yes 8,096 7.0 5.4 6.0 9.0 7.8 1.44 1.30-1.59 <0.001
 No 14,004 4.7 4.6 4.3 5.6 5.8 1.27 1.19-1.36 <0.001

1n refers to number of cases of atonic postpartum hemorrhage.

2P value based on data for all years between 2000 and 2009.

RR denotes rate ratio and 95% CI denotes 95% confidence intervals.

Mehrabadi et al.

Mehrabadi et al. BMC Pregnancy and Childbirth 2012 12:108   doi:10.1186/1471-2393-12-108

Open Data