| N | Percent (%) | Mean | SD |
---|---|---|---|---|
Age | 1565 | Â | 14.37 | 1.99 |
Sex | Â | Â | Â | Â |
 Male | 715 | 45.7 |  |  |
 Female | 850 | 54.3 |  |  |
SES | 1545 | Â | 2.18 | 0.55 |
 Low | 120 | 7.7 |  |  |
 Medium | 1034 | 66.1 |  |  |
 High | 401 | 25.6 |  |  |
PA | Â | Â | Â | Â |
 Self-report | 1545 |  | 278.62 | 199.32 |
 Device-based | 1068 |  | 307.86 | 134.55 |
HRQoL | Â | Â | Â | Â |
 Overall HRQOL (Kidscreen-10 Index) | 1432 |  | 52.15 | 8.46 |
 Physical wellbeing | 1481 |  | 50.1 | 9.02 |
 Psychological wellbeing | 1485 |  | 50.95 | 8.94 |
 Autonomy and parent relations | 1474 |  | 54.74 | 0.12 |
 Social support and peers | 1479 |  | 51.43 | 8.77 |
 School environment | 1455 |  | 52.05 | 7.97 |