Table 4.

Forward model selection for overall survival before weighting.

	HR	95% CI	p
Blood transfusion	1.39	0.98~1.97	0.067
Age	1.02	0.84~0.94	0.002
BMI	0.94	1.12~1.37	0.002
Primary tumor (T3,4 vs. T1,2)	1.77	1.07~1.25	0.002
Lymph node involvement	3.44	1.85~5.24	<0.001

HR: hazard ratio; CI: confidence interval; BMI: body mass index.