Table 4

Temporal Trends in atonic postpartum hemorrhage with blood transfusion by maternal, fetal and obstetrical characteristics, British Columbia, 2000-2009
Parity All years Rate per 10,000 deliveries 2009 vs. 2000 P for trend2
n1 rate 2000 2001 2008 2009 RR 95% CI
 Nulliparous 534 15.3 20.1 19.9 39.5 31.3 1.56 1.04-2.34 <0.001
 Parous 342 28.3 16.0 14.1 18.3 20.4 1.28 0.83-1.98 0.04
Maternal Age (in years)
 <20 56 36.6 27.3 28.6 47.7 55.8 2.05 0.67-6.24 0.07
 20-34 612 19.8 15.8 15.0 27.3 25.5 1.61 1.13-2.30 <0.001
 ≥35 208 23.8 23.4 20.4 28.4 21.2 0.91 0.48-1.70 0.41
BMI
 Underweight 41 23.9 10.4 26.4 25.5 18.4 1.78 0.30-10.62 0.10
 Normal 362 20.6 16.3 19.1 30.4 20.4 1.25 0.77-2.03 0.03
 Overweight 115 19.8 17.3 13.6 25.0 24.1 1.39 0.62-3.08 0.02
 Obese 58 17.8 10.1 6.5 27.3 18.6 1.85 0.48-7.14 0.09
Plurality
 Singleton 832 20.5 17.0 15.3 27.0 24.8 1.46 1.07-1.97 <0.001
 Multiple 44 70.7 76.3 113.9 105.6 68.0 0.89 0.24-3.30 0.84
Birthweight (in grams)
 <2500 59 27.8 5.1 59.2 39.4 29.9 5.92 0.73-48.08 0.69
 2500-3999 637 19.0 17.2 13.8 22.5 22.0 1.28 0.91-1.81 0.002
 ≥4000 177 32.3 26.0 18.8 58.3 45.4 1.75 0.92-3.32 <0.001
Gestational age (in weeks)
 <28 7 20.1 0.0 34.5 24.0 21.8 - - 0.69
 28-36 110 33.8 25.1 36.6 45.7 46.4 1.85 0.77-4.45 0.05
 37-41 739 20.0 17.1 15.3 27.0 23.3 1.37 0.99-1.89 <0.001
 ≥42 17 26.6 35.2 0.0 16.5 34.0 0.96 0.16-5.75 0.61
Vaginal delivery
 Spontaneous 321 12.9 11.8 10.2 17.6 16.4 1.39 0.87-2.21 0.004
 Instrumental 244 54.7 31.2 41.4 73.3 73.6 2.36 1.29-4.32 <0.001
Cesarean delivery
 No labour 110 20.7 26.9 18.1 21.5 24.7 0.92 0.41-2.04 0.57
 With labour, no induction 129 30.4 31.2 30.0 33.7 29.0 0.93 0.43-2.01 0.59
 With induction 72 32.2 20.3 9.3 65.0 28.8 1.42 0.42-4.83 0.01
Previous cesarean
 Yes 111 19.8 29.5 18.4 27.6 29.1 0.99 0.50-1.97 0.60
 No 765 21.5 16.2 16.4 28.3 24.9 1.53 1.10-2.13 <0.001
Induction of labour
 Yes 236 26.9 19.9 18.9 44.3 31.3 1.57 0.86-2.86 0.002
 No 640 19.7 17.3 16.0 24.1 24.0 1.39 0.99-1.96 <0.001
Augmentation of labour (oxytocin)
 Yes 172 27.3 23.2 15.4 38.4 38.0 1.64 0.86-3.12 <0.001
 No 704 20.2 16.9 16.9 26.2 23.1 1.37 0.98-1.92 <0.001
Epidural analgesia
 Yes 340 29.4 23.4 20.9 40.2 35.4 1.51 0.92-2.48 <0.001
 No 536 18.1 15.9 15.1 23.2 21.4 1.35 0.93-1.96 0.003

1n refers to number of cases of atonic postpartum hemorrhage with blood transfusion.

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