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Table 4 Longitudinal associations between sedentary behaviour, physical activity and bone stiffness index percentiles after 2 years

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

  Whole group Thin/normal weight group Overweight/obese group
β (99%CI) p-value β (99%CI) p-value β (99%CI) p-value
Main sample (self-reported data,, N = 1653)
 Baseline watching TV/video/DVD (hours/week) 0.06(− 0.33,0.44) 0.712 0.28(− 0.18,0.74) 0.118 − 0.63(− 1.34,0.07) 0.021
 Baseline playing computer/games (hours/week) 0.02(− 0.57,0.60) 0.943 − 0.12(− 0.81,0.57) 0.651 0.42(− 0.67,1.50) 0.318
 Baseline sports clubs (hours/week) 1.07(− 0.23,2.36) 0.034 0.96(− 0.54,2.46) 0.098 1.03(− 1.54,3.60) 0.299
 Change of watching TV/video/DVD (hours/week) 0.11(− 0.28,0.49) 0.468 0.36(−0.10,0.81) 0.042 −0.63(−1.35,0.08) 0.022
 Change of playing computer/games (hours/week) 0.09(−0.35,0.54) 0.593 0.09(− 0.47,0.64) 0.688 0.32(− 0.41,1.04) 0.258
 Change of sports clubs (hours/week) 1.28 (0.30,2.26) 0.001 1.29 (0.10,2.48) 0.005 1.04(−0.63,2.70) 0.110
 Weight bearing sports
 Moderate or high mechanical loads vs. No or low mechanical loads (reference) −0.69(−4.99,3.61) 0.678 0.32(− 4.76,5.41) 0.870 −3.13(−11.14,4.89) 0.313
Subsample (accelerometer data, N = 839)
 Baseline sedentary time (hours/day) 0.60(−1.77,2.96) 0.516 0.99(−1.86,3.85) 0.369 −0.39(−4.65,3.86) 0.811
 Baseline light physical activity (hours/day) −0.81(−3.50,1.89) 0.439 −1.60(−4.93,1.73) 0.214 0.16(−4.46,4.78) 0.927
 Baseline moderate-to-vigorous physical activity (10 min/day) 2.77 (1.50,4.05) < 0.001 2.97 (1.53,4.42) < 0.001 2.85(−0.12,5.81) 0.013
 Change of sedentary time (hours/day) −0.85(−2.58,0.88) 0.205 −1.19(−3.25,0.87) 0.135 0.10(−3.09,3.29) 0.935
 Change of light physical activity (hours/day) −0.94(−3.03,1.16) 0.249 −1.45(−3.99,1.09) 0.140 0.42(−3.26,4.10) 0.768
 Change of moderate-to-vigorous physical activity (10 min/day) 1.05(−0.09,2.18) 0.018 0.89(−0.39,2.16) 0.073 1.76(−0.88,4.40) 0.084
  1. Adjusted for baseline age, sex, socio-economic status, daylight, bone stiffness index percentiles, height and weight z-scores, country as a random effect