Table 1.

Covariates excluded from model due to having no significant association with postpartum haemorrhage

Month of delivery	Chorionic villus biopsy in pregnancy
Congenital abnormality suspected in pregnancy	Amniocentesis in pregnancy
Actual congenital abnormality	Interpreter required
Booking appointment after 20 weeks gestation	Previous terminations
Mother’s Carstairs quintile [25] (a measure of deprivation)	Previous miscarriages
Maternal skeletal condition (eg previous fractured pelvis, spinal abnormality)	Fibroids
Borderline maternal hypertension (BP 140 systolic or 90 diastolic)	Maternal inflammatory bowel disorder
Mother’s smoking status