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.