Table 2

Primary analysis: relative risk of intrapartum and neonatal (<28 days) mortality for the onset of labour in midwife-led versus obstetrician-led care subgroup analyses; mortality by parity and by intended place of birth.

Outcome(A) Unmatched cohort(B) Matched cohort
Midwife-led care, 
n=46 764
Obstetrician-led care, 
n=10 632
OR (95% CI)Midwife-led care, 
n=10 632
Obstetrician-led care, 
n=10 632
OR (95% CI)
Primary analysis
 Intrapartum and neonatal mortality30 (0.64‰)2 (0.19‰)3.41 (0.82 to 14.28)8/10 632 (0.75‰)2/10 632 (0.19‰)4.00 (0.85 to 18.85)
Subgroup analyses
Parity
 Nulliparous22/21 074 (1.04‰)2/4376 (0.46‰)2.29 (0.54 to 9.72)6/4344 (1.38‰)2/4376 (0.46‰)3.02 (0.61 to 14.99)
 Multiparous8/25 690 (0.31‰)0*/6256 (0.00‰)4.14 (0.24 to 71.8)2/6288 (0.16‰)0*/6256 (0.00‰)4.98 (0.24 to 103.7)
Intended place of birth†
In case of midwife-led care:
 Home18/23 329 (0.77‰)2/10 632 (0.19‰)†4.10 (0.95 to 17.69)3/5160 (0.58 ‰)2/10 632 (0.19‰)†3.09 (0.52 to 18.51)
 Hospital10/18 680 (0.54‰)2.85 (0.62 to 13.00)4/4401 (0.91‰)4.84 (0.89 to 26.41)
 Unknown2/4755 (0.42‰)1/1071 (0.93‰)
  • *For all comparisons, the obstetrician-led care hospital group was the reference because an intended home birth in the obstetrician-led care group is not possible.

  • †Unable to calculate, no deaths in obstetrician-led care group; therefore, 0.5 was added to each cell in order to be able to calculate the OR.

  • Results presented for the unmatched and matched cohort.