Preoperative blood markers and intra-abdominal infection after colorectal cancer resection

Table 4 Diagnostic value of receiver operating characteristic curve evaluation index

Independent variable	Cutoff	AUC	Sensitivity	Specificity	Youden index	P value	95%CI
NLR	2.67	0.890	0.867	0.800	0.667	0.000	0.811-0.969
PLR	213.18	0.842	0.933	0.723	0.656	0.000	0.757-0.927
SII	826.24	0.937	0.215	0.785	0.785	0.000	0.886-0.989
CEA (μg/L)	4.03	0.728	0.667	0.708	0.375	0.006	0.595-0.861

NLR: Neutrophil-lymphocyte ratio; PLR: Platelet-lymphocyte ratio; SII: Systemic immune-inflammation index; CEA: Carcinoembryonic antigen; AUC: Area under the curve.