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 factorsNumber of womenUnadjusted 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 years32 (50.0)30 (36.5)1.7 (0.8 to 3.3)
 Body mass index at booking ≥30 kg/m26 (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 ≥318 (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)
 Atony29 (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.