Table 3

Simple associations between potential correlates and intensity-specific physical activity (LPA, MPA, VPA), adjusting for age, sex and mean accelerometer wear time: β-coefficients and 95% CIs (n=425)

LPA (min/day)MPA (min/day)VPA (min/day)
β (95% CI)P valueβ (95% CI)P valueβ (95% CI)P value
BMI z-score0.52 (−2.88 to 3.92)0.764−1.52 (−2.51 to −0.53) 0.003 −1.99 (−2.89 to −1.08) <0.0001
Self-efficacy (0–4)*1.63 (−3.25 to 6.50)0.5132.91 (1.51 to 4.31) <0.00012.85 (1.57 to 4.14) <0.0001
TV viewing (hours/day)1.93 (−1.61 to 5.46)0.284−0.28 (−1.32 to 0.75)0.590−0.09 (−1.05 to 0.87)0.854
Computer use (hours/day)−4.83 (−8.58 to −1.09) 0.012 −1.48 (−2.58 to −0.38) 0.008 −0.54 (−1.55 to 0.48)0.301
Sport participation (ref=no sport)7.51 (−0.45 to 15.47) 0.064 3.47 (1.15 to 5.79) 0.004 2.64 (0.48 to 4.80) 0.017
Active transport (ref=passive transport)−6.05 (−14.01 to 1.91)0.1365.62 (3.34 to 7.90) <0.00012.42 (0.30 to 4.55) 0.025
SES (parental education level)
 University degreeRef0.422Ref0.635Ref0.343
 A levels6.15 (−3.05 to 15.34)0.189−0.39 (−3.09 to 2.32)0.779−0.48 (−2.97 to 2.00)0.703
 GCSEs or less2.71 (−6.58 to 11.99)0.5671.00 (−1.72 to 3.73)0.4701.45 (−1.02 to 3.92)0.249
Parent support (0–4)*6.24 (1.67 to 10.81) 0.008 1.94 (0.60 to 3.28) 0.005 1.80 (0.55 to 3.04) 0.005
Ownership of a mobile phone (ref=no mobile)−7.95 (−16.12 to 0.21) 0.056 −1.65 (−4.05 to 0.76)0.179−1.80 (−3.98 to 0.39)0.107
Outdoor time after school (hours/day)2.66 (−0.11 to 5.42) 0.060 1.53 (0.73 to 2.33) 0.000 0.79 (0.05 to 1.53) 0.038
Proportion of pupils attending school sport/PA clubs
 ≤24%Ref0.740Ref 0.008 Ref0.224
 25%–49%5.64 (−18.12 to 29.39)0.6416.18 (0.63 to 11.73) 0.029 1.88 (−1.85 to 5.62)0.322
 ≥50%−3.69 (−29.18 to 21.81)0.776−2.36 (−8.38 to 3.66)0.441−1.50 (−5.66 to 2.66)0.479
Presence of school crossing guards (ref=none)−8.23 (−27.80 to 11.33)0.4095.60 (0.47 to 10.72) 0.032 3.63 (0.52 to 6.75) 0.023
Heavy traffic around school (ref=not a problem)−4.76 (−25.20 to 15.68)0.647−0.96 (−6.65 to 4.73)0.740−1.99 (−5.26 to 1.27)0.231
  • Schools were treated as random effects in all models.

  • Bold font indicates significant results (P<0.10).

  • *Higher scores denote greater levels of self-efficacy and parent support.

  • BMI, body mass index; GCSE, General Certificate of Secondary Education; LPA, light-intensity physical activity; MPA, moderate-intensity physical activity; PA, physical activity; ref, reference category; SES, socioeconomic status; TV, television; VPA, vigorous-intensity physical activity.