Table 1 General characteristics of the 159 patients

Total

100

59

NA

Average age (year)

74.2 (22–100)

60.4 (21–90)

< 0.05

 Male

73 (73%)

41 (69.5%)

0.71

 Female

27 (27%)

18 (30.5%)

Concurrent conditions

95 (95.0%)

52 (88.1%)

0.13

 Cerebral infarction

84

4

< 0.05

 Cardiovascular disease

76

24

< 0.05

  Chronic lung diseases

40

13

0.02

  Diabetes mellitus

25

18

0.47

  Malignant solid tumor

20

7

0.27

  Renal insufficiency

23

8

0.21

 Immunosuppressive state

14

11

0.5

 Hepatic disease

13

2

0.06

  Hematologic malignancy

6

13

< 0.05