Table 1.
Characteristics of participants.
| Boys | Girls | |||||||
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| Age 8 | Age 11 | Age 13 | Age 15 | Age 8 | Age 11 | Age 13 | Age 15 | |
|
| ||||||||
| n=243 | n=219 | n=199 | n=133 | n=252 | n=233 | n=202 | n=134 | |
|
| ||||||||
| Mean (95% CI) | Mean (95% CI) | |||||||
| Age (years) | 8.8 (8.7, 8.9) | 11.2 (11.2, 11.3) | 13.3 (13.2, 13.3) | 15.4 (15.3, 15.4) | 8.8 (8.7, 8.8) | 11.2 (11.2, 11.3) | 13.2 (13.2, 13.3) | 15.3 (15.3, 15.4) |
| Height (m) | 1.35 (1.34, 1.36) | 1.49 (1.48, 1.50) | 1.63 (1.62, 1.64) | 1.75 (1.74, 1.76) | 1.33 (1.32, 1.34) | 1.49 (1.48, 1.50) | 1.61 (1.60, 1.62) | 1.64 (1.63, 1.66) |
| Body weight (kg) | 33.7 (32.5, 34.9) | 45.4 (43.6, 47.2) | 58.2 (55.9, 60.4) | 69.8 (66.9, 72.7) | 31.8 (30.8, 32.9) | 44.6 (43.0, 46.2) | 55.8 (53.8, 57.8) | 61.9 (59.4, 64.4) |
| BMI (kg/m2) | 18.3 (17.8, 18.7) | 20.2 (19.6, 20.8) | 21.7 (21.0, 22.3) | 22.7 (21.9, 23.6) | 17.8 (17.4, 18.3) | 19.8 (19.3, 20.4) | 21.5 (20.8, 22.2) | 22.9 (22.0, 23.7) |
| Accelerometer wear time (hrs/day) | 12.6 (12.5, 12.7) | 12.6 (12.5, 12.7) | 12.7 (12.6, 12.8) | 13.1 (12.9, 13.2) | 12.5 (12.4, 12.6) | 12.5 (12.4, 12.6) | 12.9 (12.7, 13.0) | 13.0 (12.8, 13.2) |
| Daily breaks in sedentary time (times/day) | 470 (462, 479) | 441 (432, 450) | 391 (381, 401) | 308 (298, 319) | 460 (452, 468) | 420 (412, 429) | 368 (359, 378) | 284 (273, 295) |
| Sedentary time (hrs/day) | 4.8 (4.7, 4.9) | 5.3 (5.2, 5.4) | 6.4 (6.2, 6.6) | 8.1 (7.9, 8.3) | 4.9 (4.8, 5.0) | 5.6 (5.5, 5.7) | 6.9 (6.7, 7.0) | 8.4 (8.2, 8.6) |
| MVPA time (min/day) | 63.2 (59.8, 66.6) | 63.6 (61.8, 69.5) | 51.5 (49.3, 56.0) | 40.1 (37.1, 44.3) | 45.0 (42.6, 47.5) | 38.1 (35.8, 40.4) | 33.2 (30.6, 35.9) | 28.1 (25.0, 31.2) |
| MVPA counts (×103 counts/day) | 243 (227, 259) | 263 (245, 281) | 204 (189, 219) | 153 (136, 170) | 174 (162, 186) | 148 (137, 159) | 132 (119, 145) | 105 (91, 118) |
| Body fat mass (kg) | 8.1 (7.5, 8.8) | 11.9 (10.9, 13.0) | 13.8 (12.6, 15.1) | 13.5 (12.0, 15.1) | 8.8 (8.2, 9.4) | 12.7 (11.8, 13.6) | 15.3 (14.1, 16.4) | 17.6 (16.0, 19.1) |
BMI, body mass index; CI, confidence interval; MVPA, moderate- to vigorous-intensity physical activity.