CXCL8 and schizophrenia: Similar results were found for IL-8 (t(110) = −2.92, p = 0.024) and TNFα (U = 799.5, p < 0.001) proteins in the serum which were both significantly higher in people with schizophrenia (IL-8 mean = 10.29 pg/ml, SD = 4.88; TNFα median = 10.94 pg/ml) than in healthy controls (IL-8 mean = 8.13 pg/ml, SD = 2.93; TNFα median = 8.08 pg/ml) (Fig. 1).