Variables | Regression coefficient | β | P | |||
95% CI | ||||||
Constant | 4.49 | 3.91 | to | 5.08 | 4.49 | <0.001 |
Grade | −0.03 | −0.05 | to | 0.00 | −0.04 | 0.071 |
Gender (male: 1; female: 2) | 0.24 | 0.15 | to | 0.33 | 0.09 | <0.001 |
School day sleep duration | −0.44 | −0.49 | to | −0.39 | −0.42 | <0.001 |
Standardized BMI | −0.06 | −0.10 | to | −0.01 | −0.04 | 0.011 |
Self-reported academic performance | 0.02 | −0.04 | to | 0.07 | 0.01 | 0.543 |
Sleepiness during class | 0.02 | −0.04 | to | 0.08 | 0.01 | 0.522 |
Breakfast taking | 0.01 | −0.07 | to | 0.09 | 0.01 | 0.768 |
Defecation frequency | −0.03 | −0.08 | to | 0.02 | −0.02 | 0.233 |
After-school activity (hrs./week) | −0.02 | −0.02 | to | −0.01 | −0.10 | <0.001 |
Physical activity (days/week) | −0.07 | −0.09 | to | −0.06 | −0.16 | <0.001 |
Average screen time a day (hrs) | 0.05 | 0.00 | to | 0.11 | 0.03 | 0.070 |