Table 2.

ROC analysis of age, APACHE II, ISS, lactate, albumin, lactate clearance rate, LAR and combined indicators for predicting poor short-term prognosis in polytrauma (bootstrap-corrected)

Indicator	AUC	Standard Error	P-value	95% CI	Cut-off Value	Sensitivity	Specificity
Age (years)	0.636	0.61	0.03	0.517–0.755	57.5	0.500	0.765
APACHE II	0.931	0.020	< 0.01	0.884–0.977	22.5	0.857	0.894
ISS	0.812	0.040	< 0.01	0.735–0.889	20.5	1	0.565
Lactate at Admission (mmol/L)	0.663	0.060	0.04	0.548–0.777	4.745	0.571	0.718
Lactate at 24 h (mmol/L)	0.742	0.060	< 0.01	0.624–0.860	4.795	0.500	0.929
Lactate at 48 h (mmol/L)	0.886	0.040	< 0.01	0.811–0.960	2.08	0.857	0.847
Albumin at Admission (g/L)	0.596	0.070	0.15	0.466–0.726	32.25	0.571	0.659
Albumin at 24 h (g/L)	0.606	0.060	0.10	0.480–0.732	32.35	0.679	0.529
Albumin at 48 h (g/L)	0.704	0.060	< 0.01	0.593–0.814	28.75	0.536	0.800
LAR at Admission	0.667	0.060	0.04	0.550–0.784	0.183	0.464	0.859
LAR at 24 h	0.749	0.060	< 0.01	0.635–0.862	0.087	0.714	0.718
LAR at 48 h	0.901	0.030	< 0.01	0.838–0.965	0.074	0.857	0.859
lactate clearance	0.658	0.06	< 0.01	0.544–0.772	0.521	0.329	0.929
Composite Index	0.968	0.010	< 0.01	0.939–0.996	0.882	0.964	0.918

ROC receiver operating characteristic; APACHE II Acute Physiology and Chronic Health Evaluation II; ISS Injury Severity Score; LAR lactate albumin ratio