Epidemiological risk factors (see supporting evidence section for Sheiner reference) OR = odds ratio
Previous PPH
Maternal obesity (CEMACH)
Hypertensive disorders OR 1.7
LGA OR 1.9
Antepartum haemorrhage including abruption
Placenta praevia, with risk of accreta increasing with each previous CS
Induction of labour OR 1.4
Augmented labour OR 1.4
Prolonged second stage OR 3.4
Operative vaginal delivery OR 2.3
Lacerations OR 2.4
Retained placenta OR 3.5
Placenta accreta OR 3.3
Caesarean section is strongly associated with peripartum hysterectomy (see supporting evidence section for Stanco et al reference).