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Empirical receiver operating curves for predictive performance of preoperative IL-8 levels (top, N = 178) and postoperative IL-8 increase (bottom, N = 157 for plasma) with 98.75% CIs. Postoperative increase was defined as the difference between IL-8 concentrations (Δc) between the first postoperative day (cd1) and the baseline measurement (cd0): Δc(IL-8) = cd1(IL-8)-cd0(IL-8).
