GSTM1 and major depressive disorder: On the other hand, lower Hb (OR = 0.92, 95% CI: 0.86, 0.97), education more than high school (OR = 0.73, 95% CI: 0.63, 0.84), mild-high family income (OR = 0.63, 95% CI: 0.54, 0.73), and vegetable intake (OR = 0.92, 95% CI: 0.87, 0.97) were negatively associated with depression.