Baseline APACHE II scores and plasma levels of protein C, F1 + 1, APC, and F1 + 2-to-APC ratios in survivors versus nonsurvivors. Baseline APACHE II scores (A), protein C levels (B), F1 + 2 levels (C), APC levels (D), and ratios of F1 + 2 to APC (E) for survivors and nonsurviving patients were compared using the Wilcoxon rank sum test. The means, standard deviations, minimums, and maximums of these parameters are summarized in Table 3.