Table 1 Sample characteristics by quartiles of time spent in prolonged sedentary bouts (≥30 min), the Ryobi Health Survey 2009 – 2010 (n = 430)

Age group, % (n)

<0.001

 40–49

48.6

(52)

45.4

(49)

62.6

(67)

76.9

(83)

 50–59

40.2

(43)

41.7

(45)

28.0

(30)

20.4

(22)

 60–64

11.2

(12)

13.0

(14)

9.3

(10)

2.8

(3)

Women, % (n)

13.1

(14)

13.9

(15)

13.1

(14)

13.9

(15)

0.9130

Education, college or university level, % (n)

36.4

(39)

57.4

(62)

72.0

(77)

73.1

(79)

<0.001

Current smoker, % (n)

36.4

(39)

38.9

(42)

29.0

(31)

25.0

(27)

0.028

Family income (JPY), % (n)

0.028

  < 4 million

19.6

(21)

20.4

(22)

5.6

(6)

2.8

(3)

 4–8 million

57.9

(62)

49.1

(53)

65.4

(70)

74.1

(80)

 8+ million

22.4

(24)

30.6

(33)

29.0

(31)

23.1

(25)

Moderate-to-vigorous physical activity, min/wk, median (interquartile range)

50

(11, 141)

66

(23, 168)

57

(11, 151)

41

(11, 174)

0.564

Device wear-time, min/d, median (interquartile range)

850

(785, 916)

843

(790, 922)

834

(787, 912)

865

(776, 929)

0.7503

Central obesity, % (n)

14.0

(15)

11.1

(12)

13.1

(14)

11.1

(12)

0.635

Elevated blood pressure, % (n)

29.0

(31)

33.3

(36)

28.0

(30)

32.4

(35)

0.801

Hypertriglyceridemia, % (n)

10.3

(11)

18.5

(20)

16.8

(18)

24.1

(26)

0.015

Low HDL-cholesterol level, % (n)

1.9

(2)

2.8

(3)

4.7

(5)

1.9

(2)

0.799

Hyperglycemia, % (n)

40.2

(43)

35.2

(38)

32.7

(35)

25.9

(28)

0.026

Number of affected components, % (n)^b

0.878

 Zero

30.8

(33)

29.6

(32)

33.6

(36)

27.8

(30)

 One

43.0

(46)

39.8

(43)

37.4

(40)

49.1

(53)

 Two

26.2

(28)

30.6

(33)

29.0

(31)

23.1

(25)