Table 2.

Area under the curve

Preoperative Factor	Area	Std. Errora	P	95% CI
				Lower Bound	Lower Bound
CA153	0.725	0.046	<0.001	0.634	0.816
CEA	0.741	0.046	<0.001	0.652	0.831
CA153 and CEA	0.789	0.043	<0.001	0.704	0.874
WBC	0.608	0.053	0.042	0.505	0.711
CA153 and CEA and WBC	0.806	0.041	<0.001	0.725	0.888

^aUnder the nonparametric assumption.