Table 3

Results of model with postpartum haemorrhage as the outcome
Unadjusted odds ratio Adjusted odds ratio 95% confidence interval for adjusted odds ratio
Intended place of birth (reference, home)
Hospital ***2.7 ***2.5 1.7 3.8
(Suspected) macrosomia? (reference, no)
Yes ***4.1 **2.7 1.3 5.6
Previous baby with birthweight >4500g? (reference, no)
Yes ***2.1 *1.6 1.1 2.4
Mother’s BMI (reference, <30)
30-34 ***1.4 ***1.4 1.3 1.6
Borderline anaemia? (8.5-10.5g/dl) (reference, no)
Yes ***1.4 ***1.3 1.2 1.4
Parity (reference, multipara)
Primipara ***1.7 ***2.0 1.9 2.2
Mother’s age at delivery (reference, 30–34)
<20 **0.7 ***0.6 0.4 0.7
20-24 ***0.8 ***0.7 0.6 0.8
25-29 **0.9 ***0.8 0.8 0.9
35-39 *1.1 *1.2 1.0 1.3
40+ ***1.6 ***1.6 1.3 2.1
Mother’s ethnic group (reference, White European)
Black African ***1.8 ***1.6 1.3 1.9
Black Caribbean 1.2 1.2 0.9 1.5
Mediterranean 0.9 0.8 0.6 1.1
Oriental ***1.7 **1.6 1.2 2.0
South Asian 0.9 1.0 0.9 1.1
Other *1.3 1.0 0.8 1.2
Missing 0.9 1.0 0.8 1.3
Current baby’s birthweight (reference, 2500g-3999g)
Low (<2500g) *0.7 **0.6 0.4 0.8
High (4000g+) ***2.4 ***2.6 2.4 2.9
Sex of baby (reference, girl)
Boy ***0.8 ***0.8 0.7 0.8
Number of ultrasound scans during current pregnancy (reference, 1)
0 1.3 1.3 1.0 1.7
2 ***1.3 **1.2 1.1 1.3
3 ***1.2 *1.1 1.0 1.3
4 ***1.7 ***1.6 1.4 1.9
>4 ***1.7 ***1.6 1.2 2.0
Missing 1.0 0.8 0.6 1.2
Year of delivery (reference, 1988)
1989 1.1 1.1 0.9 1.4
1990 **1.4 **1.4 1.1 1.7
1991 1.1 1.1 0.9 1.4
1992 *1.2 *1.3 1.0 1.5
1993 1.2 1.2 0.9 1.4
1994 1.2 1.2 0.9 1.4
1995 ***1.5 **1.4 1.2 1.8
1996 **1.4 *1.3 1.1 1.6
1997 ***1.6 **1.4 1.1 1.7
1998 ***1.6 **1.4 1.1 1.7
1999 ***1.7 ***1.5 1.2 1.8
2000 ***1.7 ***1.5 1.2 1.8
Hospital providing care (anonymised) (reference, H)
A 0.9 1.0 0.8 1.3
B **0.7 **0.7 0.6 0.9
C 0.9 0.9 0.7 1.2
D ***1.6 **1.3 1.1 1.6
E 1.1 *1.4 1.1 1.8
F 1.0 1.0 0.9 1.3
G **0.8 **0.7 0.6 0.9
I ***1.4 ***1.6 1.3 1.9
J ***1.4 **1.3 1.1 1.6
K *1.2 1.0 0.8 1.2
L *0.8 0.9 0.7 1.1
M 1.0 1.0 0.8 1.1
N 0.9 0.9 0.7 1.1
O 1.2 1.1 0.9 1.3
Time of delivery (reference, 10:00–11:59)
00:00–01:59 1.2 1.2 1.0 1.4
02:00–03:59 0.9 0.9 0.7 1.1
04:00–05:59 0.9 1.0 0.8 1.2
06:00–07:59 0.9 1.0 0.8 1.2
08:00–09:59 1.2 1.2 1.0 1.4
12:00–13:59 1.2 1.2 1.0 1.4
14:00–15:59 *1.2 *1.2 1.0 1.5
16:00–17:59 **1.3 *1.2 1.0 1.5
18:00–19:59 **1.3 *1.2 1.0 1.5
20:00–21:59 *1.2 *1.2 1.0 1.5
22:00–23:59 *1.3 *1.2 1.0 1.5

*** p < 0.001, ** p < 0.01, * p < 0.05.

Nove et al.

Nove et al. BMC Pregnancy and Childbirth 2012 12:130   doi:10.1186/1471-2393-12-130

Open Data