Table 1.

Charlson comorbidity score

Weight	Clinical Conditions
1	Myocardial infarct; congestive heart failure; peripheral vascular disease; dementia; cerebrovascular disease; chronic lung disease; connective tissue disease; ulcer; chronic liver disease
2	Hemiplegia; moderate or severe kidney disease; diabetes; diabetes with complication; tumor; leukemia; lymphoma
3	Moderate or severe liver disease
6	Malignant tumor; metastasis; AIDS