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Table 3 Cross-sectional associations between sedentary behaviour, physical activity and bone stiffness index percentiles at baseline

From: Cross-sectional and longitudinal associations between physical activity, sedentary behaviour and bone stiffness index across weight status in European children and adolescents

 Whole groupThin/normal weight groupOverweight/obese group
β (99%CI)p-valueβ (99%CI)p-valueβ (99%CI)p-value
Main sample (self-reported data, N = 2008)
 Watching TV/video/DVD (hours/week)− 0.23(− 0.53,0.06)0.044− 0.35(− 0.69,-0.01)0.0080.03(− 0.60,0.66)0.906
 Playing computer/games (hours/week)− 0.004(− 0.49,0.48)0.9840.03(− 0.52,0.58)0.8830.03(− 0.96,1.01)0.943
 Sports clubs (hours/week)1.00(− 0.40,2.39)0.0660.50(− 1.03,2.04)0.3982.68(− 0.58,5.95)0.034
 Weight bearing sports
 Moderate or high mechanical loads vs. No or low mechanical loads (reference)− 1.80(−6.37,2.77)0.310− 0.13(−5.16,4.91)0.948−8.05(− 18.68,2.59)0.051
Subsample (accelerometer data, N = 1037)
 Sedentary time (hours/day)− 0.11(− 2.11,1.90)0.8911.01(− 1.29,3.31)0.256−3.85(−7.82,0.13)0.013
 Light physical activity (hours/day)−0.94(− 3.06,1.19)0.255−1.46(− 3.90,0.99)0.124− 0.22(− 4.50,4.05)0.893
 Moderate-to-vigorous physical activity (10 min/day)0.70(− 0.32,1.73)0.0771.18 (0.03,2.33)0.008− 0.23(− 2.62,2.17)0.807
  1. Adjusted for baseline age, sex, socio-economic status, daylight, height and weight z-score, country as a random effect