Table 3 Cross-sectional associations between sedentary behaviour, physical activity and bone stiffness index percentiles at baseline
| Â | 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 = 2008) | ||||||
 Watching TV/video/DVD (hours/week) | − 0.23(− 0.53,0.06) | 0.044 | − 0.35(− 0.69,-0.01) | 0.008 | 0.03(− 0.60,0.66) | 0.906 |
 Playing computer/games (hours/week) | − 0.004(− 0.49,0.48) | 0.984 | 0.03(− 0.52,0.58) | 0.883 | 0.03(− 0.96,1.01) | 0.943 |
 Sports clubs (hours/week) | 1.00(− 0.40,2.39) | 0.066 | 0.50(− 1.03,2.04) | 0.398 | 2.68(− 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) | 0.891 | 1.01(− 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) | 0.077 | 1.18 (0.03,2.33) | 0.008 | − 0.23(− 2.62,2.17) | 0.807 |