Table 2.

The values of RDW, CEA, and CA19-9 alone and combined biomarkers for differential diagnosis of CRC patients and CA patients.

Variables	AUC	Cut-off	Sensitivity	Specificity	95% confidence interval
					Upper limit	Lower limit
RDW	0.502	14.05	29%	82%	0.469	0.534
CEA	0.741	5.00	41%	90%	0.714	0.768
CA19-9	0.613	37.00	17%	94%	0.581	0.644
RDW+CEA	0.738		57%	78%	0.711	0.765
RDW+CA19-9	0.604		53%	66%	0.572	0.634
CEA+CA19-9	0.744		57%	79%	0.717	0.771
RDW+CEA+CA19-9	0.741		51%	84%	0.714	0.769