GSTM1 and cardiovascular disorder: In the exploratory analysis by type of complication, Hb (RR = 0.86; 95% CI, 0.73–0.99; p = 0.047) was a statistically significant protective factor for neurological complications, while in the analysis of infectious complications, all factors except for the history of prior medication for cardiovascular disease lost statistical significance (RR = 2.79; 95% CI, 1.16–6.71; p = 0.022), after adjusting for the confounders (Table 9).