Table 2 The detailed information and incidence of CCI (Chronic Comorbidity Index) in present study

1 point

 Myocardial infarction

4

5

 Congestive heart failure

1

1

 Peripheral vascular disease

21

19

 Cerebrovascular disease

2

4

 Dementia

0

0

 Chronic pulmonary disease

2

6

 Connective tissue disease

3

4

 Ulcer disease

2

5

 Mild liver disease

1

1

 Diabetes

11

10

2 points

 Hemiplegia

0

2

 Moderate or severe renal disease

1

2

 Diabetes with end organ damage

0

0

 Any tumor

1

1

 Leukemia

0

0

 Lymphoma

0

0

3 points

 Moderate or severe liver disease

1

1

6 points

 Metastatic solid tumor

0

1

 AIDS

0

0