HMOX1 and peripheral arterial disease: The odds ratios for PAD and CAD were 2.12 (95% CI = 1.03–4.37, P < 0.05) and 0.65 (95% CI = 0.42–0.99, P < 0.05) for the HO-1 level of <0.35 ng/mL, respectively (Table 3).