Table 1.
Summary of the participants at each data collection period
| Data collection period | |||||
|---|---|---|---|---|---|
| 7y | 9y | 12y | 15y | ||
| Sample | n (% with valid data) | 502 (97) | 506 (98) | 420 (95) | 306 (94) |
| Sex (male) | % | 50.2 | 48.2 | 46.9 | 46.7 |
| Age (years) | Mean (SD) | 7.5 (0.5) | 9.3 (0.4) | 12.5 (0.3) | 15.2 (0.4) |
| Weight (kg) | Mean (SD) | 26.4 (5.2) | 33.5 (7.6) | 49.6 (12.2) | 62.2 (14.1) |
| Height (cm) | Mean (SD) | 124.9 (5.6) | 135.6 (6.4) | 154.6 (7.8) | 167.0 (8.3) |
| BMI (kg/m2) | Mean (SD) | 16.8 (2.3) | 18.0 (2.9) | 20.6 (3.9) | 22.2 (4.4) |
| FMI (kg/m2)a | Mean (SD) | 4.0 (1.8) | 4.8 (2.4) | 5.4 (3.3) | 6.5 (4.1) |
| SB (min) | Mean (SD) | 346.5 (66.4) | 372.8 (63.3) | 466.5 (86.6) | 535.1 (85.6) |
| SB (% of wear time) | Mean (SD) | 51.5 (7.7) | 55.4 (7.0) | 64.8 (8.2) | 73.4 (6.6) |
| LPA (min) | Mean (SD) | 254.9 (44.9) | 236.8 (43.0) | 197.4 (45.9) | 144.1 (34.5) |
| LPA (% of wear time) | Mean (SD) | 38.2 (5.6) | 35.3 (5.2) | 27.7 (6.1) | 20.1 (4.8) |
| MVPA (min) | Mean (SD) | 69.8 (24.0) | 63.0 (22.9) | 53.9 (23.3) | 46.4 (20.0) |
| MVPA (% of wear time) | Mean (SD) | 10.5 (2.6) | 9.4 (3.2) | 7.6 (3.3) | 6.5 (3.0) |
LPA time spent in light physical activity per day, MVPA time spent in moderate-to-vigorous physical activity per day, BMI body mass index, FMI fat mass index
aSmaller sample due to missing data (7 y n 500, 9 y n 424; 12 y n 378; 15 y n 298)