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Table 1 Baseline characteristics of the SPEEDY study sample for participants with valid physical activity (PA) data (N=839), baseline PA values (% of worn time) and changes in PA % for school time and travel time

From: School related factors and 1yr change in physical activity amongst 9–11 year old English schoolchildren

  

Proportion/mean (SD)

Measures

Activity intensity

Total (N = 839)

Boys (N = 349)

Girls (N = 490)

Age (years)

 

10.23 (0.30)

10.22 (0.29)

10.24 (0.31)

BMI (kg/m2)

 

18.00 (3.04)

17.74 (2.74)

18.18 (3.23)

Parental education: a-levels or higher

 

41.8%

45.0%

39.6%

White ethnicity

 

97.0%

97.4%

96.7%

School time (9-15h)

    

  Baseline PA (% of worn time)

Sedentary

69.49 (5.82)

66.99 (5.99)

71.27 (4.98)

 

Moderate

5.23 (1.58)

6.09 (1.62)

4.62 (1.23)

 

Vigorous

2.96 (1.53)

3.67 (1.70)

2.45 (1.16)

  Change PA (change in %)

Sedentary

−0.19 (6.08)

−0.75 (6.42)+

0.20 (5.80)

 

Moderate

0.18 (1.75)++

0.27 (1.88)++

0.11 (1.65)

 

Vigorous

−0.04 (1.50)

0.10 (1.79)

−0.13 (1.25)+

Travel time (8-9h, 15-16h)

    

  Baseline PA (% of worn time)

Sedentary

55.92 (8.12)

54.33 (8.65)

57.06 (7.52)

 

Moderate

10.52 (4.78)

10.82 (4.72)

10.31 (4.81)

 

Vigorous

3.41 (2.55)

4.07 (2.81)

2.95 (2.24)

  Change PA (change in %)

Sedentary

0.40 (8.30)

−0.30 (8.61)

0.90 (8.04)+

 

Moderate

0.07 (4.69)

0.29 (4.39)

−0.08 (4.89)

 

Vigorous

0.07 (4.69)

0.33 (2.67)+

−0.12 (2.23)

  1. + p value change in physical activity <0.05; ++ p value change in physical activity <0.01.