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Correlations among the study variables
| Main variables | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| 1. ADHD symptoms | 1 | |||||
| 2. Sleep problems | .48*** | |||||
| 3. Sleep length (weekday) | −.11* | −.10+ | ||||
| 4. Sleep length (weekend) | .01 | .06 | .21*** | |||
| 5. Bedtime activities (screen) | .05 | .08+ | .02 | −.02 | ||
| 6. Bedtime activities (diet) | .14** | .12* | .04 | −.02 | .55*** | |
| 7. Anxiety/depression | .24*** | .69*** | −.08+ | 0 | .05 | .08+ |
+P < 0.1, *P < 0.05, **P < 0.001, ***P < 0.0001
