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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.