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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