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Table 5 Longitudinal associations between sedentary behaviour, physical activity and bone stiffness index percentiles after 6 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 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 = 716)
 Baseline watching TV/video/DVD (hours/week)− 0.18(− 0.80,0.44)0.444−0.18(− 0.93,0.57)0.531−0.36(−1.50,0.77)0.404
 Baseline playing computer/games (hours/week)0.24(−0.59,1.08)0.4480.33(−0.73,1.39)0.420−0.16(−1.51,1.20)0.766
 Baseline sports clubs (hours/week)1.79(−0.16,3.74)0.0181.99(−0.29,4.27)0.0240.59(−3.20,4.38)0.686
 Change of watching TV/video/DVD (hours/week)−0.16(− 0.61,0.29)0.362− 0.20(− 0.74,0.34)0.335−0.10(− 0.93,0.72)0.744
 Change of playing computer/games (hours/week)−0.13(− 0.59,0.33)0.4720.11(− 0.45,0.67)0.617−0.75(−1.58,0.07)0.019
 Change of sports clubs (hours/week)1.01(−0.10,2.12)0.0201.54 (0.23,2.85)0.002−0.46(−2.64,1.73)0.588
 Weight bearing sports
 Moderate or high mechanical loads vs. No or low mechanical loads (reference)4.47(−2.29,11.22)0.0882.48(−5.39,10.36)0.41611.26(−1.69,24.22)0.025
Subsample (accelerometer data, N = 398)
 Baseline sedentary time (hours/day)−0.44(−4.00,3.13)0.7510.08(−4.19,4.35)0.9611.03(−5.82,7.88)0.693
 Baseline light physical activity (hours/day)−2.70(−7.01,1.62)0.106−1.68(−6.76,3.41)0.393−5.13 (12.46,2.19)0.068
 Baseline moderate-to-vigorous physical activity (10 min/day)3.67 (1.55,5.79)< 0.0013.49 (1.03,5.95)< 0.0014.94 (0.92,8.97)0.002
 Change of sedentary time (hours/day)−0.18(−2.55,2.18)0.8400.16(−2.69,3.01)0.884−1.61(−5.51,2.28)0.277
 Change of light physical activity (hours/day)−0.53(−3.78,2.71)0.6700.11(−3.70,3.92)0.938−2.18(−7.82,3.45)0.309
 Change of moderate-to-vigorous physical activity (10 min/day)1.53(−0.04,3.10)0.0121.74(−0.10,3.59)0.0150.87(−2.09,3.83)0.441
  1. Adjusted for baseline age, sex, socio-economic status, daylight, bone stiffness index percentiles, height and weight z-scores and puberty at six-year follow-up, country as a random effect