(Group 1) Nulliparous with single cephalic pregnancy, > 37 Weeks gestation in spontaneous labour
(Group 2) Nulliparous with single cephalic pregnancy, > 37 weeks gestation who either had labour induced or were delivered by caesarean section before labour
(Group 3) Multiparous without a previous uterine cephalic pregnancy, > 37 weeks gestation in spontaneous labour
(Group 4) Multiparous without a previous uterine scar, with single cephalic pregnancy, > 37 weeks gestation who either had labour induced or were delivered by caesarean section before labour
(Group 5) All Multiparous with at least one previous uterine scar, with single cephalic pregnancy, > 37 weeks gestation
(Group 6) All nulliparous women with single breech pregnancy
(Group 7) All multiparous women with single breech pregnancy, including women with previous uterine scars
(Group 8) All women with multiple pregnancies, including women with previous uterine scars
(Group 9) All women with a single pregnancy with a transverse or oblique lie, including women with previous uterine scars.
(Group 10) All women with a single cephalic pregnancy < 37 weeks gestation, including women with previous scars.
