Table 1 Demographic characteristics of the participants

 60–69

6

 70–79

8

 80–89

5

 Male

7

 Female

12

 Illiterate

1

 Primary school

4

 Junior high

10

 Senior high

3

 College

1

  ≤ 1

4

 2–4

6

  ≥ 5

9

 Living alone

13

 Living with children

5

 Living with grandchildren

1

 1000–2000

4

 2001–3999

12

  ≥ 4000

3

 Retirement allowance

15

 Commercial insurance

3

 Funds by adult children

1

 None

4

 1–2

13

  ≥ 3

2