Comparison by Robson group
When compared by Robson group, there was a combined reduction in the size of groups 3 and 4 (term, singleton, cephalic, parous women) from 40% to 33% of all births and an increase in the size of groups 1 and 2 (term, singleton, cephalic, nulliparous women) from 39% to 44% of all births (Table 3). There was an increase in the size of group 5 (term, cephalic, previous caesarean delivery) from 5.6% to 11% of all births.
Increases were also found in the caesarean delivery rate within groups 1 and 2A (term, singleton, cephalic, nulliparous women who laboured) with a combined rise from 12% to 21%. Further, there were substantial increases in caesarean delivery rates for groups 1, 2A, 5, 6, 7, 8, and 10 as shown in Table 3.