Variable | 7y n = 507 (252 girls, 255 boys) | 9y n = 510 (265 girls, 245 boys) | 12y n = 425 (227 girls, 198 boys) | 15y n = 310 (166 girls, 144 boys) | ||||||||||||
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mean | SD | median | IQR | Mean | SD | Median | IQR | mean | SD | median | IQR | mean | SD | median | IQR | |
Age (years) | 7.5 | 0.5 | 7.4 | 7.2, 7.8 | 9.3 | 0.4 | 9.3 | 9.1, 9.6 | 12.5 | 0.3 | 12.5 | 12.3, 12.7 | 15.2 | 0.4 | 15.2 | 14.9, 15.5 |
Wear time (min/d) | 670.7 | 69.1 | 680.6 | 632.4, 716.1 | 672.9 | 75.5 | 679.3 | 630.7, 725.8 | 717.8 | 82.4 | 729.7 | 663.8, 782.5 | 725.5 | 82.6 | 738.1 | 682.3, 785.5 |
Sedentary time (min/d) | 346.5 | 66.6 | 349.5 | 302.6, 383.8 | 373.1 | 63.5 | 373.6 | 329.1, 417.0 | 467.3 | 87.3 | 466.8 | 409.4, 524.1 | 535.4 | 85.4 | 542.1 | 478.7, 595.6 |
Sedentary time (%/d) | 51.6 | 7.7 | 51.3 | 46.4, 56.1 | 55.4 | 6.9 | 55.5 | 50.6, 60.5 | 64.9 | 8.3 | 64.7 | 59.8, 70.7 | 73.5 | 6.6 | 74.2 | 69.3, 78.4 |
Duration break (min) | 3.5 | 0.3 | 3.4 | 3.2, 3.6 | 3.5a | 0.3 | 3.4 a | 3.3, 3.7 | 4.1 | 3.2 | 3.7 | 3.5, 3.9 | 3.9b | 0.4 | 3.8 b | 3.6, 4.2 |
Breaks per hour > 1 min | 8.5 | 1.3 | 8.6 | 7.7, 9.4 | 7.7 | 1.2 | 7.7 | 6.9, 8.5 | 5.7 | 1.6 | 5.8 | 4.8, 6.7 | 4.2 | 1.1 | 4.1 | 3.4, 4.9 |
Bouts per hour of sedentary time | 16.7 | 1.7 | 16.9 | 15.9, 17.8 | 16.7a | 1.6 | 16.9 a | 15.9, 17.8 | 15.2 | 2.3 | 15.5 | 13.8, 16.8 | 12.9 | 2.5 | 12.9 | 11.4, 14.6 |
Bouts lasting 1–4 min | 82.8 | 13.9 | 83.6 | 74.1, 92.5 | 89.2 | 14.3 | 90.0 | 79.3, 98.7 | 95.2 | 17.6 | 95.4 | 83.5, 106.3 | 85.7 a | 20.8 | 85.3 a | 73.5, 98.3 |
Bouts lasting 5–9 min | 8.2 | 2.9 | 8.2 | 6, 10.3 | 10.1 | 3.3 | 10.0 | 8, 12.2 | 14.2 | 4.3 | 14.3 | 11.3, 17.3 | 16.6 | 4.1 | 16.7 | 14, 19.3 |
Bouts lasting 10-14 min | 1.7 | 1.0 | 1.6 | 1, 2.3 | 2.3 | 1.2 | 2.0 | 1.4, 3 | 3.8 | 1.8 | 3.8 | 2.4, 5.0 | 5.3 | 1.9 | 5.3 | 4, 6.6 |
Bouts lasting 15-29 min | 0.8 | 0.7 | 0.6 | 0.3, 1.1 | 1.1 | 0.9 | 0.9 | 0.4, 1.4 | 2.2 | 1.5 | 2.1 | 1.1, 3.0 | 3.8 | 2.0 | 3.7 | 2.3, 5 |
Bouts lasting +30 min | 0.3 | 0.7 | 0.1 | 0.0, 0.3 | 0.2 a | 0.3 | 0.0 a | 0, 0.3 | 0.4 | 0.7 | 0.3 | 0.0, 0.6 | 1.1 | 1.0 | 0.9 | 0.4, 1.5 |
Sedentary bout length at 50th percentile of sedentary time (min) | 3.4 | 3.8 | 2.4 | 1.9, 3.2 | 3.0 | 1.8 | 2.7 | 2.2, 3.4 | 4.6 | 2.9 | 3.9 | 3.1, 5.2 | 7.3 | 3.9 | 6.4 | 4.8, 8.5 |