Table 1.
Participants’ characteristics
| All (n = 2698) Mean (SD) |
Boys (n = 1262) Mean (SD) |
Girls (n = 1436) Mean (SD) |
p-value | |
|---|---|---|---|---|
| Age (years) | 13.4 (2.3) | 13.3 (2.2) | 13.5 (2.3) | 0.025 |
| Body mass (kg) | 50.7 (13.3) | 51.4 (14.9) | 50.0 (11.8) | < 0.001 |
| Height (m) | 1.6 (0.1) | 1.6 (0.1) | 1.6 (0.1) | < 0.001 |
| BMI (kg/m2); HFZ (%) | 20.4 (3.8); 70.5% | 20.2 (3.8); 67.6% | 20.6 (3.8); 73.1% | 0.922 |
| Season % (spring; summer; autumn; winter) | 35%; 0.7%; 28%; 36% | 40%; 0.4%; 29%; 32% | 32%; 1.0%; 27%; 41% | < 0.001 |
| Curl ups (repeats); HFZ (%) | 36.0 (17.3); 90.4% | 40.6 (18.0); 92.4% | 31.8 (15.6); 88.7% | < 0.001 |
| Push-ups (repeats); HFZ (%) | 10.9 (7.3); 66.6% | 13.9 (8.2); 64.7% | 8.20 (5.2); 68.2% | < 0.001 |
| Sit and reach (cm); HFZ (%) | 24.8 (6.7); 57.2% | 22.9 (6.5); 77.6% | 26.5 (6.5); 39.3% | 0.363 |
| Pacer 20 m (laps); HFZ (%) | 39.6 (19.5); 78.5% | 49.6 (21.5); 89.7% | 30.8 (11.9); 68.7% | < 0.001 |
| Sedentary time (min/day) | 498.3 (94.0) | 482.8 (96.9) | 512.0 (89.3) | < 0.001 |
| Prolonged SB (bouts/day) | 1.0 (0.8) | 1.1 (0.8) | 1.0 (0.8) | 0.205 |
| Non-prolonged SB (bouts/day) | 120.3 (16.6) | 119.3 (16.2) | 121.1 (16.8) | 0.767 |
| Breaks in SB (breaks/day) | 87.5 (13.9) | 86.9 (13.7) | 87.9 (14.2) | 0.372 |
| LIPA (min/day) | 302.7 (78.6) | 308.9 (80.3) | 297.3 (76.7) | 0.265 |
| MVPA (min/day) | 37.3 (22.0) | 45.9 (23.9) | 29.7 (17.1) | < 0.001 |
p-value for the T-test in continuous variables, and the qui-square test to compare differences in proportions between boys and girls
n number of participants, SD standard deviation, HFZ healthy fitness zone, SB sedentary behavior, BMI body mass index, LIPA light intensity physical activity, MVPA moderate-to-vigorous physical activity, PACER progressive aerobic cardiovascular endurance run