GSTM1 and peripheral arterial disease: The low Hb/Cr group was older (66.8 vs. 59.7 years, p < 0.001), had a higher prevalence of cardiovascular risk factors (hypertension, diabetes, and PAD, all with p < 0.001), and a greater burden of prior cardiovascular events, malignancy, and bleeding (all p < 0.001).