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 |