CXCL8 and major depressive disorder: As shown in Table 3, the plasma level of Glu in MDD patients at discharge was significantly higher than that at admission (t = −13.026, p < 0.005); the plasma levels of IL-17 (t1 = 9.252), IL-1β (t2 = 9.106), IL-6 (t3 = 14.321), TNF-α (t4 = 9.762), and IL-8 (t5 = 9.848) at discharge were lower compared to those at admission (all p < 0.005), while the plasma levels of p11(t6 = −9.656) and BDNF (t7 = −18.698) were higher at discharge than those at admission (all p < 0.005).