Table 1 Sample characteristics (%)

Age

n = 1685

n = 1085

n = 600

 30–49

33.6

31.6

37.2

 50–69

48.6

48.3

49.1

 70–87

17.8

20.1

13.7

Education^a

n = 1659

n = 1072

n = 587

 Low

33.6

35.9

29.5

 Middle

32.0

32.5

31.2

 High

34.4

31.6

39.3

Household income^b

n = 1563

n = 982

n = 581

 Low

17.7

21.5

11.2

 Low middle

31.8

32.5

30.8

 High middle

32.7

30.6

36.1

 High

17.8

15.4

21.9

Degree of anxiety/depression

n = 1685

n = 1085

n = 600

 Moderate

97.3

96.9

98.0

 Severe

2.7

3.1

2.0