Table 2.
Baseline and changes of measurements over two-year and six-year follow-up
| Baseline | Two-year changes | Six-year changes | ||||
|---|---|---|---|---|---|---|
| Thin/normal weight | Overweight/obese | Thin/normal weight | Overweight/obese | Thin/normal weight | Overweight/obese | |
| (N = 1627 a/833 b) | (N = 381 a/204 b) | (N = 1273 a/633 b) | (N = 380 a/206 b) | (N = 523 a/302 b) | (N = 193 a/96 b) | |
| Anthropometric measures (Mean, SD) c | ||||||
| Percentiles of bone stiffness index | 43.92 (27.84) | 41.36 (25.76) | 3.86 (30.17) | 4.60 (25.55) | 8.08 (34.59) * | 18.88 (33.46) * |
| Height z-score | 0.37 (1.00) * | 0.87 (1.02) * | 0.04 (0.40) | 0.06 (0.39) | 0.20 (0.60) * | 0.05 (0.68) * |
| Weight z-score | 0.07 (0.87) * | 2.00 (0.78) * | 0.03 (0.38) * | 0.19 (0.52) * | 0.21 (0.66) * | 0.43 (0.87) * |
| Reported healthy behaviour | ||||||
| Watching TV/video/DVD (hours/week, Mean, SD) c | 8.67 (5.00) * | 9.74 (5.32) * | 0.62 (4.57) | 0.71 (5.13) | 2.05 (6.41) | 3.09 (7.57) |
| Playing computer/games (hours/week, Mean, SD) c | 2.34 (3.39) | 2.69 (3.58) | 1.38 (3.58) * | 2.17 (4.66) * | 2.84 (5.83) | 3.63 (7.16) |
| Sports clubs (hours/week, Mean, SD) c | 1.13 (1.60) | 1.32 (1.63) | 0.72 (1.77) | 0.56 (1.89) | 1.41 (2.56) | 0.90 (2.67) |
| Weight bearing sports (N, %) d | ||||||
| Moderate or high mechanical loads | 752 (79.5) | 194 (20.5) | 866 (76.5) | 266 (23.5) | 396 (73.5) | 143 (26.5) |
| No or low mechanical loads | 875 (82.4) | 187 (17.6) | 407 (78.1) | 114 (21.9) | 127 (71.8) | 50 (28.2) |
| Accelerometer data (Mean, SD) | ||||||
| Sedentary time (hours/day) c | 4.46 (1.21) * | 4.72 (1.26) * | 0.70 (1.39) | 0.61 (1.42) | 2.31 (1.53) | 2.41 (1.59) |
| Light physical activity (hours/day) c | 6.37 (1.00) | 6.39 (1.10) | −0.46 (1.14) | −0.57 (1.23) | −1.47 (1.28) | − 1.56 (1.29) |
| Moderate-to-vigorous physical activity (10 min/day) c | 4.28 (2.21) * | 3.57 (1.93) * | −0.23 (2.43) | − 0.45 (1.96) | 0.10 (2.61) | − 0.50 (2.72) |
a Sample size with full information of self-reported physical activity and sedentary behaviour as well as co-variables. b Sample size with full information of accelerometer data as well as co-variables. c Changes of values were the differences between follow-up and baseline measurements. d Changes of values were the percentages of reported moderate or high mechanical loads at baseline or follow-up, and no or low mechanical loads in both waves, respectively. * p < 0.01