Table 2 Sample characteristics (overall and by age group)

Age (years)

Mean (SD)

38.4 (16.1)

25.0 (4.5)

41.1 (4.4)

55.7 (4.4)

72.2 (7.0)

Sex

Female

50.8

49.5

50.3

52.6

56.2

<0.0001

Education

No formal

26.1

19.3

27.5

36.5

40.1

<0.0001

≤Primary

31.0

31.7

31.0

29.5

30.7

Secondary completed

33.7

39.8

31.6

24.8

22.9

Tertiary completed

9.2

9.3

10.0

9.3

6.3

Wealth

Poorest

20.1

19.3

19.6

19.8

27.3

<0.0001

Poorer

20.0

19.3

19.9

20.6

22.5

Middle

19.9

20.3

19.6

19.5

19.5

Richer

20.0

20.6

20.2

19.8

16.1

Richest

20.0

20.5

20.7

20.4

14.6

Chronic conditions

Angina

14.6

8.9

14.3

22.2

32.5

<0.0001

Arthritis

13.0

6.0

12.6

24.1

33.3

<0.0001

Asthma

5.2

3.9

4.8

7.0

9.6

<0.0001

Chronic back pain

6.6

3.2

6.8

10.9

16.6

<0.0001

Diabetes

3.0

0.7

2.6

7.3

9.0

<0.0001

Edentulism

5.9

1.5

3.5

10.9

28.9

<0.0001

Hearing problem

3.4

1.0

1.8

4.5

20.0

<0.0001

Tuberculosis

1.7

1.3

1.5

2.5

2.6

<0.0001

Visual impairment

1.3

0.4

0.9

2.2

6.4

<0.0001

Number of chronic conditions

0

65.3

78.8

65.7

45.7

25.1

<0.0001

1

21.7

16.8

23.5

29.8

28.2

2

8.5

3.6

8.2

15.6

23.5

3

3.1

0.7

2.1

6.4

14.0

≥4

1.4

0.1

0.5

2.5

9.2