Table 1 Participant characteristics
From: Association between sleep habits and behavioral problems in early adolescence: a descriptive study
| Â | N | % |
|---|---|---|
Sex | Â | Â |
Male | 296 | 49.0 |
Female | 308 | 51.0 |
Family composition | Â | Â |
Single-parent household | 44 | 7.3 |
Two-parent household | 560 | 92.7 |
Annual household income (Â¥) | Â | Â |
 < 3,000,000 | 46 | 7.7 |
3,000,000–6,000,000 | 246 | 41.4 |
6,000,000–9,000,000 | 169 | 28.5 |
 ≥ 9,000,000 | 133 | 22.4 |
Mother’s educational background |  |  |
Middle school or high school | 109 | 18.2 |
Junior college or vocational school | 241 | 40.2 |
University or graduate school | 249 | 41.6 |
Father’s educational background |  |  |
Middle school or high school | 140 | 24.0 |
Junior college or vocational school | 76 | 13.0 |
University or graduate school | 367 | 63.0 |