Table 3.
Risk factors possibly contributing to the choice of intervention in women undergoing hysterectomy or interventional radiology for obstetric haemorrhage, unadjusted and adjusted OR (95% CI) for hysterectomy (only) per risk factor
| Risk factors | Number of women | Unadjusted OR (95% CI) for hysterectomy only |
Adjusted OR (95% CI) for hysterectomy only | |
| Hysterectomy only, n=64 n, % | Interventional radiology only, n=82 n, % | |||
| Demographic factors | ||||
| Maternal age ≥35 years | 32 (50.0) | 30 (36.5) | 1.7 (0.8 to 3.3) | |
| Body mass index at booking ≥30 kg/m2¶ | 6 (9.3) | 3 (3.6) | 2.7 (0.6 to 11.3) | |
| Obstetric factors | ||||
| Preterm (<37 weeks) | 28 (43.8) | 24 (29.3) | 1.8 (0.9 to 3.7) | |
| Parity ≥3 | 18 (28.1) | 7 (8.5) | 2.7 (1.4 to 9.4)§ | 7.2 (2.1 to 24.6)§ |
| Previous caesarean delivery¶ | 31 (48.4) | 18 (21.9) | 3.3 (1.6 to 6.8)§ | 2.3 (0.9 to 6.3) |
| Caesarean delivery (≥22 weeks)*¶ | 38/59 (64.4) | 37/82 (45.1) | 2.2 (1.1 to 4.3)§ | 1.6 (0.6 to 4.0) |
| Cause of bleeding | ||||
| AIP and AIP+praevia¶ | 16 (25.0) | 9 (10.9) | 2.7 (1.1 to 6.6)§ | 3.0 (0.9 to 10.0) |
| Atony | 29 (45.3) | 52 (63.4) | 0.4 (0.2 to 0.9)§ | 0.9 (0.3 to 2.3) |
| Organisational factors | ||||
| Weekend and/or non-office hours†¶ | 24/60 (40.0) | 34/80 (42.5) | 0.9 (0.4 to 1.7) | |
| Interventional radiology NOT available‡ | 30 (46.8) | 15 (18.2) | 3.9 (1.8 to 8.2)§ | 8.2 (3.1 to 21.6)§ |
*Exclusion of 5 cases<22 weeks.
†Based on date and time of delivery.
‡Emergency interventional radiology service availability in the maternity unit where the woman gave birth.
§p<0.05.
¶Missing data: body mass index (n=27), previous caesarean delivery (n=1), delivery mode (n=1), placenta location (n=13), date of delivery (n=2), time of delivery (n=5), week/weekend (n=3).
AIP, abnormally invasive placenta.