CRP and systemic inflammatory response syndrome: Subsequent steps in the logistic regression refinement process led to a final model that included the following variables: Age (P < 0.001, 95% CI [1.015, 1.045]), CRP (P = 0.03, 95% CI [1.003, 1.008]), CTSI (P < 0.001, 95% CI [1.588, 5.460]), SIRS (P < 0.001, 95% CI [1.782, 7.667]), and Hematocrit (P < 0.001, 95% CI [0.848, 0.930]).