Table 5. ORs and 95% CIs for negative feeling upon awakening by educational status among children in kindergarten, elementary school, and junior high school.
| Kindergarten | Elementary school | Junior high school | Total | |||||
| ORa | 95% CI | ORa | 95% CI | ORa | 95% CI | ORa | 95% CI | |
| Time of awakening | ||||||||
| <6:30 | 1 | 1 | 1 | 1 | ||||
| ≥6:30 | 2.25 | 0.65–7.79 | 2.59 | 1.86–3.6 | 1.54 | 1.05–2.26 | 1.96 | 1.54–2.48 |
| Bedtime | ||||||||
| <22:00 | 1 | 1 | 1 | 1 | ||||
| ≥22:00 | 1.56 | 0.41–5.89 | 2.59 | 1.9–3.53 | 3.07 | 1.51–6.24 | 2.49 | 1.91–3.25 |
| Sleep duration | ||||||||
| ≥8 h | 1 | 1 | 1 | |||||
| <8 h | 1.92 | 1.26–2.93 | 1.93 | 1.3–2.87 | 1.92 | 1.46–2.53 | ||
| Television | ||||||||
| <2 h | 1 | 1 | 1 | 1 | ||||
| ≥2 h | 1.27 | 0.6–2.69 | 1.79 | 1.34–2.4 | 1.35 | 0.98–1.87 | 1.51 | 1.23–1.85 |
| Video games | ||||||||
| <30 min | 1 | 1 | 1 | 1 | ||||
| ≥30 min | 1.32 | 0.45–3.9 | 1.72 | 1.28–2.31 | 1.48 | 1.01–2.17 | 1.5 | 1.2–1.87 |
| Personal computer | ||||||||
| <30 min | 1 | 1 | 1 | |||||
| ≥30 min | 1.63 | 1.11–2.41 | 1.11 | 0.78–1.57 | 1.35 | 1.04–1.75 | ||
| Cellular phone | ||||||||
| <30 min | 1 | 1 | 1 | |||||
| ≥30 min | 1.52 | 0.83–2.8 | 0.86 | 0.54–1.35 | 1.15 | 0.8–1.65 | ||
aOR and 95% CI were calculated by multivariate logistic regression analysis adjusted for sex and school year.