Table 1. Characteristics of participants.
| Characteristic | All (N = 815) |
| Age, years | |
| mean (SD) | 14.1 (2.5) |
| Gender | |
| Boys, n (%) | 444 (54.5) |
| Girls, n (%) | 371 (45.5) |
| Grade level | |
| 4 (∼10 years old), n (%) | 81 (9.9) |
| 5 (∼11 years old), n (%) | 90 (11.0) |
| 6 (∼12 years old), n (%) | 89 (10.9) |
| 7 (∼13 years old), n (%) | 104 (12.8) |
| 8 (∼14 years old), n (%) | 98 (12.0) |
| 9 (∼15 years old), n (%) | 100 (12.3) |
| 10 (∼16 years old), n (%) | 93 (11.4) |
| 11 (∼17 years old), n (%) | 100 (12.3) |
| 12 (∼18 years old), n (%) | 60 (7.4) |
| Parental education | |
| Mother and/or father has tertiary qualification, n (%) | 433 (53.1) |
| Child Health Utility 9D utility scores, SG | |
| mean (SD) | 0.81 (0.11) |
| Child Health Utility 9D utility scores, BWS | |
| mean (SD) | 0.75 (0.14) |
| Total metabolic equivalent (MET) level | |
| mean (SD) | 1932.1 (1811.6) |
| Average homework hours per day in the last 7 days | |
| mean (SD) | 2.3 (1.2) |
| Average sleep duration hours per day in the last 7 days | |
| mean (SD) | 7.6 (1.2) |
| Self-assessed health status | |
| Excellent, n (%) | 276 (33.9) |
| Very good, n (%) | 315 (38.7) |
| Good, n (%) | 145 (17.8) |
| Fair or poor, n (%) | 79 (9.7) |
SD - standard deviation; SG - standard gambling method; BWS - best worst scaling method.