A Delivery before 34 weeks occurs in 20% of twins.

B Spontaneous preterm labour is more common in the presence of fetal compromise.

C Uterine abnormalities such as fibroids or müllerian abnormalities are a cause of first-trimester miscarriage, but not preterm delivery.

D Cervical surgery and recurrent terminations of pregnancy protect against preterm delivery.

E Infection is very common with preterm delivery.

F Pre-eclampsia is associated with preterm delivery.