The model suggested that aneurysm volume loss is worthy ofattention owing to its negative association with the Hb level 24 h after EVAR.Furthermore, history of hypertension should be included in the post-operativerisk assessment of patients with AAA undergoing EVAR treatment as it is a riskfactor for anaemia 24 h after the procedure. This evidence concerns the gene GSTM1 and Hypertension.