Table 1 Socio-demographic characteristics

Average age

Mean (SD)

71.4 (5.4)

69.9 (6.9)

0.42

68.8 (8.5)

67.2 (6.1)

0.39

Marital status

Single

6

4

0.93

2

28

< 0.01

Married

17

12

16

28

Education

Primary school

0

4

< 0.01

0

32

< 0.01

Junior high school

0

1

1

6

Senior high school

3

2

6

6

College

0

3

8

3

University

20

5

3

8

Graduate school

0

1

0

1

Chronic diseases

None

3

7

0.02

11

11

< 0.01

1+

23

9

10

45

Drinking alcohol

No

5

16

< 0.01

12

56

< 0.01

Yes

18

0

6

0

Smoking

Non-smoker

21

16

-

16

55

0.48

Smoker

0

0

0

1

Daily exercise

Yes

17

12

0.93

13

53

0.01

Never

6

4

5

3