IL-8 levels in the plasma (H(3) = 7.76, p = 0.051) showed a significant 78% increase in the elevated cytokine schizophrenia subgroup as compared to the low cytokine schizophrenia subgroup (p = 0.047) (Fig. 4a, pairwise comparisons with adjusted p values). Here, CXCL8 is linked to schizophrenia.