Post-hoc analyses revealed that Cp levels in the SC1 group were significantly lower than those in the SC2 group and the control group (P < 0.01), there is also a significant difference in serum ceruloplasmin between the full schizophrenia group (SC1+SC2) and healthy controls (P < 0.01), while no significant difference was found between the SC2 group and the control group. Here, CP is linked to schizophrenia.