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Table 1 Participant Characteristics and Summary Measures of Sedentary Behavior Variables

From: Development of sedentary behavior across childhood and adolescence: longitudinal analysis of the Gateshead Millennium Study

Variable

7y

n = 507 (252 girls, 255 boys)

9y

n = 510 (265 girls, 245 boys)

12y

n = 425 (227 girls, 198 boys)

15y

n = 310 (166 girls, 144 boys)

 

mean

SD

median

IQR

Mean

SD

Median

IQR

mean

SD

median

IQR

mean

SD

median

IQR

Age (years)

7.5

0.5

7.4

7.2, 7.8

9.3

0.4

9.3

9.1, 9.6

12.5

0.3

12.5

12.3, 12.7

15.2

0.4

15.2

14.9, 15.5

Wear time (min/d)

670.7

69.1

680.6

632.4, 716.1

672.9

75.5

679.3

630.7, 725.8

717.8

82.4

729.7

663.8, 782.5

725.5

82.6

738.1

682.3, 785.5

Sedentary time (min/d)

346.5

66.6

349.5

302.6, 383.8

373.1

63.5

373.6

329.1, 417.0

467.3

87.3

466.8

409.4, 524.1

535.4

85.4

542.1

478.7, 595.6

Sedentary time (%/d)

51.6

7.7

51.3

46.4, 56.1

55.4

6.9

55.5

50.6, 60.5

64.9

8.3

64.7

59.8, 70.7

73.5

6.6

74.2

69.3, 78.4

Duration break (min)

3.5

0.3

3.4

3.2, 3.6

3.5a

0.3

3.4 a

3.3, 3.7

4.1

3.2

3.7

3.5, 3.9

3.9b

0.4

3.8 b

3.6, 4.2

Breaks per hour > 1 min

8.5

1.3

8.6

7.7, 9.4

7.7

1.2

7.7

6.9, 8.5

5.7

1.6

5.8

4.8, 6.7

4.2

1.1

4.1

3.4, 4.9

Bouts per hour of sedentary time

16.7

1.7

16.9

15.9, 17.8

16.7a

1.6

16.9 a

15.9, 17.8

15.2

2.3

15.5

13.8, 16.8

12.9

2.5

12.9

11.4, 14.6

Bouts lasting 1–4 min

82.8

13.9

83.6

74.1, 92.5

89.2

14.3

90.0

79.3, 98.7

95.2

17.6

95.4

83.5, 106.3

85.7 a

20.8

85.3 a

73.5, 98.3

Bouts lasting 5–9 min

8.2

2.9

8.2

6, 10.3

10.1

3.3

10.0

8, 12.2

14.2

4.3

14.3

11.3, 17.3

16.6

4.1

16.7

14, 19.3

Bouts lasting 10-14 min

1.7

1.0

1.6

1, 2.3

2.3

1.2

2.0

1.4, 3

3.8

1.8

3.8

2.4, 5.0

5.3

1.9

5.3

4, 6.6

Bouts lasting 15-29 min

0.8

0.7

0.6

0.3, 1.1

1.1

0.9

0.9

0.4, 1.4

2.2

1.5

2.1

1.1, 3.0

3.8

2.0

3.7

2.3, 5

Bouts lasting +30 min

0.3

0.7

0.1

0.0, 0.3

0.2 a

0.3

0.0 a

0, 0.3

0.4

0.7

0.3

0.0, 0.6

1.1

1.0

0.9

0.4, 1.5

Sedentary bout length at 50th percentile of sedentary time (min)

3.4

3.8

2.4

1.9, 3.2

3.0

1.8

2.7

2.2, 3.4

4.6

2.9

3.9

3.1, 5.2

7.3

3.9

6.4

4.8, 8.5

  1. Bouts were defined as minimum period of sedentary time without allowing any interruption; SD, standard deviation; IQR, interquartile range
  2. a not different to 7 years; b not different to 12 years