Regression coefficients for potential variables that remained after backward stepwise logistic regression to predict maternal BLL <5 or ≥5 µg/dl.

Model overall pModel was hierarchical with gestational age and haemoglobin entered in Block 1 and remaining variables in Block 2.Removed from the model (F≥0.100): gestational age, month of blood sample, dietary iron intake, taking iron supplements, social class, Neighbourhood Quality Index, number of dogs, always lived in Avon.aReference: Certificate of Secondary Education (CSE)/no qualifications.bCaffeinated plus decaffeinated.