Table 3 and Figure 2 indicate no significant differences in cystatin C levels between patients with and without psychotic symptoms in the BD, BD-M, and BD-D groups (P > 0.05 for all). Nonetheless, both the BD cohort and the healthy control group displayed notably elevated cystatin C levels in male participants compared to their female counterparts (P <0.001 for all). This evidence concerns the gene CST3 and Behcet disease.