Figure 4.

Comparison of the ROC curves of quadruple index and triple index for the prognostic value of 28-day mortality in patients with sepsis. ROC: receiver operating characteristic; AUC: area under the curve; APACHE II: Acute Physiology and Chronic Health Evaluation; AFR: albumin-to-fibrinogen ratio; triple index includes APACHE II score, lactic acid, and septic shock; quadruple index includes APACHE II score, lactic acid, septic shock, and AFR;