Table 1 Sociodemographic characteristics of the older adults in China, by region (% of the indicated population)

Age (years ± SD)

71.97 ± 7.82

71.83 ± 7.84

75.23 ± 7.17

69.53 ± 6.75

70.76 ± 7.44

73.11 ± 7.99

70.87 ± 7.76

Percentage population (%)

Age

 60–69

41.63

41.77

21.79

55.04

46.32

37.76

48.69

 70–79

39.35

40.11

48.29

35.43

38.95

37.37

37.93

  ≥ 80

19.02

18.12

29.92

9.53

14.73

24.87

13.39

Sex

 Female

46.72

44.35

42.93

47.48

48.99

50.76

47.11

 Male

53.28

55.65

57.07

52.52

51.01

49.24

52.89

Residency (by Kuhou)

 Urban

77.41

90.3

96.59

52.25

64.15

64.93

75.56

 Rural

22.59

9.7

3.41

47.75

35.85

35.07

24.44

Sample Source

 Community

48.23

45.06

49.76

51.08

28.85

66.04

44.39

 Hospital

51.77

54.94

50.24

48.92

71.15

33.96

55.61

Years of Education

 None

18.47

17.8

6.34

22.7

21.11

22.15

15.28

 Low(< 5y)

20.17

19.03

7.15

33.15

26.54

19.38

18.31

 Moderate(5-9y)

8.56

5.27

0.98

5.77

4.52

22.15

3.82

 High (> 9y)

52.79

57.9

85.53

38.38

47.83

36.32

62.58

Individual Income (by Quartile)

 Lowest

24.11

16.96

2.28

29.07

22.6

43.11

24.45

 Second

36.85

31.76

30.24

40.04

50.14

32.18

44.78

 Third

15.87

19.65

25.04

9.51

18.02

7.98

14.56

 Highest

23.17

31.63

42.44

21.39

9.24

16.73

16.21