Table 4.

Impact factors for predicting the average hospitalization cost and average lengths of stay for colorectal cancer surgery¹

Variables		Average hospitalization cost2			Average lengths of stay3
		Coefficient	Standard coefficient	P value	Coefficient	Standard coefficient	P value
Gender	Female	0.01	0.02	0.344	0.02	0.05	0.140
Age		0.01	0.08	< 0.001	0.01	0.10	0.010
Source	Inpatient or emergency room	-0.17	-0.11	< 0.001	0.10	0.10	0.010
Surgical type	High anterior resection	-0.03	-0.03	0.168	-0.06	-0.11	0.009
	Abdominoperineal resection	0.03	0.03	0.213	0.05	0.07	0.090
	Right hemicolectomy	-0.01	-0.01	0.891	0.01	0.02	0.816
	Left hemicolectomy	-0.01	-0.01	0.625	-0.01	-0.02	0.707
	Super low anterior resection	0.02	0.02	0.478	0.01	0.02	0.687
	Endoscopic polypectomy	-1.16	-0.75	< 0.001	-0.69	-0.14	< 0.001
Tumor number		0.03	0.03	0.110	-0.01	-0.01	0.805
Tumor size		0.01	0.06	0.010	0.01	0.07	0.062
No. of lymph node metastases		0.01	-0.01	0.568	0.01	0.01	0.997
Pathologic differentiation	Moderate	0.04	0.05	0.104	0.04	0.07	0.126
	Poor	0.05	0.04	0.139	0.04	0.05	0.289
Chemotherapy	Yes	-0.01	0.02	0.345	-0.02	-0.05	0.239
Distant metastasis	Yes	0.01	0.01	0.903	0.04	0.06	0.117
Tumor site	Transverse colon	0.01	0.01	0.726	0.09	0.14	0.003
	Descending colon	0.02	0.02	0.557	0.04	0.06	0.287
	Sigmoid colon	0.01	0.02	0.730	0.06	0.15	0.149
	Rectum	0.03	0.04	0.514	0.04	0.11	0.314
Tumor stage	2	0.04	0.06	0.076	0.03	0.07	0.198
	3	0.05	0.08	0.019	0.03	0.08	0.177
	4	0.17	0.17	< 0.001	0.09	0.15	0.002

¹Reference groups: gender (male), source (health examination), surgical type (low anterior resection), pathologic differentiation (well), chemotherapy (no), distant metastasis (no), tumor site (ascending colon), tumor stage (1);

²R² = 0.68 and adjusted R²=0.67;

³R² = 0.42 and adjusted R² = 0.39.