Table 1 Patient number and the incidence of each comorbidity in this study

 Myocardial infarction

50

13.6

 Congestive heart failure

55

15

 Peripheral vascular disease

18

4.9

 Cerebrovascular disease

30

8.1

 Dementia

6

1.6

 Chronic pulmonary disease

31

8.4

 Connective tissue disease

11

3

 Ulcer disease

31

8.4

 Mild liver disease

24

6.5

 Diabetes

79

21.5

 Hemiplegia

5

1.3

 Moderate or severe renal disease

25

6.8

 Diabetes with end organ damage

4

1

 Any tumor

33

9

 Leukemia

2

0.5

 Lymphoma

4

1

 Moderate or severe liver disease

0

0

 Metastatic solid tumor

2

0.5

 AIDS

0

0