CAT and type 2 diabetes mellitus: The CAT activity (BU/gHb) was lower in T2DM patients with and without DSPN in comparison to controls, but differences did not reach a significant statistical power (7.06 ± 0.9 vs. 7.05 ± 1.2 vs. 7.6 ± 1.3; P > 0.05) (Fig. 1b).