CXCL8 and post-traumatic stress disorder: Nonparametric correlation analyses revealed that plasma levels for t1 and t2 were significantly related in both control and PTSD groups for IL-6 (PTSD: r = .85, p < .0001; controls: r = .61, p = .002), IL-8 (PTSD: = .76, p < .0001; controls: = .76, p < .0001), IL-10 (PTSD: r = .92, p < .0001; controls: r = .90, p < .0001), TNF-α (PTSD: r = .78, p < .0001; controls: r = .62, p = .002) and MCP-1 (PTSD: r = .89, p < .0001; controls: r = .74, p < .0001), even after controlling for multiple comparisons.