Table 4. Assessment of Cox proportional hazards models with all-cause mortality as the dependent variable.

	Gastric cancer		Colorectal cancer		Lung cancer
	Partial model	Full model	Partial model	Full model	Partial model	Full model
C-statistic	0.856	0.859	0.784	0.789	0.787	0.789
AIC	4,887	4,884	3,643	3,636	5,913	5,908

AIC, Akaike Information Criterion; C-statistic, Harrell’s concordance statistic.

All models include the baseline variables of sex, age at diagnosis, and cancer stage at diagnosis. Full models also include the Charlson Comorbidity Index score in addition to the baseline variables.