Table 6. The accuracy of the scoring system in predicting 3-month mortality.

Variable	Bootstrap AUC	Bootstrap C-index
CCI	0.752	0.542
Serum LDH	0.776	0.602
Sex	0.757	0.555
CCI + serum LDH	0.808	0.665
CCI + sex	0.805	0.651
Serum LDH + sex	0.813	0.668
CCI + serum LDH + sex	0.859	0.747

AUC, area under the receiver operating characteristic curve; CCI, Charlson comorbidity index; LDH, lactate dehydrogenase.