Table 6. ORs and 95% CIs for negative feeling upon awakening among elementary school students who graduated from kindergarten and nursery school.
| Kindergarten | Nursery school | |||
| ORa | 95% CI | ORa | 95% CI | |
| Time of awakening | ||||
| <6:30 | 1 | 1 | ||
| ≥6:30 | 2.55 | 1.54–4.20 | 2.36 | 1.51–3.69 |
| Bedtime | ||||
| <22:00 | 1 | 1 | ||
| ≥22:00 | 3.09 | 1.87–5.11 | 2.28 | 1.50–3.46 |
| Sleep duration | ||||
| ≥8 h | 1 | 1 | ||
| <8 h | 1.74 | 0.85–3.56 | 2.00 | 1.14–3.52 |
| Television | ||||
| <2 h | 1 | 1 | ||
| ≥2 h | 1.45 | 0.91–2.32 | 1.92 | 1.29–2.86 |
| Video games | ||||
| <30 min | 1 | 1 | ||
| ≥30 min | 2.09 | 1.31–3.33 | 1.33 | 0.89–1.98 |
| Personal computer | ||||
| <30 min | 1 | 1 | ||
| ≥30 min | 1.79 | 0.97–3.30 | 1.53 | 0.90–2.62 |
| Cellular phone | ||||
| <30 min | 1 | 1 | ||
| ≥30 min | 1.28 | 0.46–3.59 | 1.77 | 0.81–3.87 |
aOR and 95% CI were calculated by multivariate logistic regression analysis adjusted for sex and school year.