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Table 2 Changes in sedentary time, LPA and MVPA (proportion of time and minutes)

From: Longitudinal changes in sedentary time and physical activity during adolescence

   

12 years Mean(SD)

15 years Mean(SD)

Difference (95% CI) Mean(SD)

P Value of difference a

Proportion of time (%)

Sedentary time (%)

School

66.22 (8.06)

74.46 (7.87)

+8.23 (7.35 to 9.13)

<0.001

After-school

63.15 (9.75)

70.14 (9.31)

+6.99 (5.91 to 8.07)

<0.001

Weekendsb

64.45 (9.00)

71.43 (10.37)

+6.86 (5.10 to 8.62)

<0.001

Light PA (%)

School

27.21 (6.26)

19.58 (5.87)

-7.62 (-8.26 to -6.98)

<0.001

After-school

27.82 (6.59)

20.80 (6.10)

-7.01 (-7.74 to -6.28)

<0.001

Weekendsb

28.24 (6.10)

21.53 (6.67)

-6.72 (-7.80 to -5.65)

<0.001

MVPA (%)

School

6.60 (3.80)

5.95 (3.53)

-0.64 (-1.11 to -0.18)

0.007

After-school

9.00 (4.95)

9.04 (5.59)

+0.04 (-0.58 to 0.67)

0.893

Weekendsb

7.31 (4.32)

7.03 (6.35)

-0.14 (-1.18 to 0.90)

0.582

Time (minutes) in each intensity

Sedentary time (minutes)

School

263.9 (36.2)

295.9 (35.7)

+32.0 (28.4 to 35.6)

<0.001

After-school

213.7 (34.1)

238.5 (33.7)

+24.8 (21.1 to 28.5)

<0.001

Weekendsb

449.6 (62.8)

498.4 (72.4)

+48.8 (36.9 to 60.6)

<0.001

LPA (minutes)

School

108.1 (24.4)

77.7 (23.1)

-30.4 (-32.9 to -27.9)

<0.001

After-school

94.5 (23.8)

71.0 (22.0)

-23.5 (-26.0 to -21.0)

<0.001

Weekendsb

197.5 (42.2)

150.6 (46.7)

-46.9 (-54.4 to -39.4)

<0.001

MVPA (minutes)

School

26.3 (14.9)

23.8 (14.4)

-2.5 (-4.4 to -0.7)

0.007

After-school

30.6 (17.2)

31.0 (19.7)

+0.4 (-1.8 to 2.5)

0.724

Weekendsb

50.7 (30.1)

49.8 (45.1)

-1.0 (-8.2 to 6.3)

0.582

  1. LPA: light intensity physical activity, MVPA: moderate to vigorous intensity physical activity. aP value is for paired samples t-tests testing difference between age 12 years and 15 years. bfor those in the weekend sample n = 199.