CXCL8 and post-traumatic stress disorder: For the measurements repeated after a one-week interval (t2), we received the same result pattern, except that the group difference for IL-8 levels was reduced to a trend [PTSD: 25% quantile 3.85, median 5.5, 75% quantile 9.08; Controls: 25% quantile 5.29, median 9.16, 75% quantile 12.71; F = 2.53, p = .08].