Table 11. The onset and process of labour: hospital admission, membrane rupture, induction, augmentation and caesarean section.

Feature	P no.	Q no.	No. with information	No. with feature
Admitted to hospital *	1140	C2b	8049	7733 admitted from home
Admitted prior to, or in labour	1141	C2a	8163	4077 before labour
How membranes ruptured	1151	C3a	8167	761 at CS; 3795 artificially
Membrane rupture before labour	1154	C3c	8139	2279 before labour
Induction of labour *	1160	C4i	8212	1627 induced
Labour was augmented	1180	C4iiia	7349	4813 augmented
Whether Caesarean section *	1212	C6c	8226	1454 CS: 519 elective; 935 emergency.

*Reasons given as text.