Table 2.

Univariate logistic regression analysis in the development set.

Characteristics		Number	OR [95% CI]	p
Age (years)	<60	289	1	0.004
	60-74	334	1.662 [1.091–2.532]
	≥75	65	2.688 [1.444–5.006]
Gender	Male	460	1	0.825
	Female	228	0.956 [0.638–1.431]
BMI (kg/m2)	<25	484	1	0.166
	≥25	204	0.753 [0.504–1.125]
Tumor size (cm)	≥5	269	1	<0.001
	<5	419	3.205 [2.023–5.078]
Tumor location	Upper (≥10 cm)	204	1	0.134
	Middle (5–10 cm)	255	1.620 [0.984–2.667]
	Lower (<5 cm)	229	1.522 [0.931–2.488]
CEA (ng/ml)	≥5	262	1	0.001
	<5	426	2.030 [1.328–3.105]