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Table 1 Covariates excluded from model due to having no significant association with postpartum haemorrhage

From: Comparing the odds of postpartum haemorrhage in planned home birth against planned hospital birth: results of an observational study of over 500,000 maternities in the UK

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