UGT1A1 and schizophrenia: In the genotype of bilirubin metabolism in male patients with schizophrenia (Fig. 4C), the TBIL level in patients with UGT1A1*6 (ANOVA: F(3,109) = 3.675, p = 0.014; UGT1A1*6 vs. wild type: p = 0.016) was significantly higher than that in wild type patients.