GSTM1 and major depressive disorder: We performed a multivariate logistic regression analysis in which phenotype (BD/MDD) was the response variable, with age, sex, mean VFT-related oxy-Hb changes of ch38, mtDNAcn, and interaction between mean VFT-related oxy-Hb changes for ch38 and mtDNAcn as the explanatory variables (Table 3).