GSTM1 and Behcet disease: The right Hb volume was significantly and positively correlated with suicidality (Spearman's ρ = 0.29, p = 0.004) in the entire patient sample (Figure 4) as well as in each diagnostic group (BD: ρ = 0.34, p = 0.04; SCZ: Spearman's ρ = 0.25, p = 0.04).