Table 3.
Intercorrelations and Descriptive Statistics of Study Variables
| Variable | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. Sex | -- | |||||||||||||||||
| 2. Age | −.15 | -- | ||||||||||||||||
| 3. Pubertal development | −.39*** | .50*** | -- | |||||||||||||||
| 4. ADHD medication use | −.06 | .12 | .11 | -- | ||||||||||||||
| 5. ADHD-IN | .17 | −.15 | −.18 | −.12 | -- | |||||||||||||
| 6. ADHD-HI | .10 | −.33** | −.28* | −.08 | .32** | |||||||||||||
| 7. # devices in bedroom | −.03 | .20 | .17 | .24* | −.13 | .01 | -- | |||||||||||
| 8. Nighttime media use | −.05 | .04 | .18 | .04 | −.20 | −.16 | .34** | -- | ||||||||||
| 9. SR Circadian preference | .17 | −.12 | −.16 | .10 | −.003 | .25* | .08 | −.24* | -- | |||||||||
| 10. SR Daytime sleepiness | −.28* | .02 | .02 | −.19 | −.05 | −.03 | −.15 | .19 | −.51*** | -- | ||||||||
| 11. SR Sleep duration | .07 | −.16 | −.08 | .14 | .03 | −.06 | −.19 | −.22* | .20 | −.18 | -- | |||||||
| 12. PR Sleep duration | −.16 | .16 | .24* | .01 | −.02 | −.17 | .10 | .35** | −.31** | .22* | −.42*** | -- | ||||||
| 13. SR Sleep/wake probs | −.22* | −.04 | .11 | −.04 | −.10 | −.06 | .12 | .34** | −.53*** | .61*** | −.28* | .33*** | -- | |||||
| 14. PR Total sleep probs | −.08 | −.10 | .07 | .01 | .30** | .02 | .09 | .27* | −.36** | .20 | −.39*** | .46*** | .32** | -- | ||||
| 15. SR Depression | −.27* | −.05 | .14 | .03 | .13 | .08 | −.06 | .25* | −.34** | .45*** | −.20 | .22* | .47*** | .35** | -- | |||
| 16. SR Anxiety | −.21 | −.08 | .13 | .01 | .04 | −.004 | .04 | .24* | −.13 | .20 | .02 | .11 | .25* | .25* | .67*** | -- | ||
| 87. PR Depression | .08 | −.01 | −.11 | −.01 | .29** | −.03 | .05 | .04 | −.09 | .02 | −.20 | .19 | .07 | .29** | .23* | .19 | -- | |
| 16. PR Anxiety | .03 | .04 | .03 | .08 | .22 | −.03 | .14 | .11 | −.02 | −.03 | .07 | .01 | −.03 | .18 | .02 | .16 | .43*** | -- |
| Mean | -- | 15.00 | 3.02 | -- | 2.98 | 2.02 | 2.36 | 5.31 | 26.32 | 13.04 | 7.40 | 3.16 | 18.41 | 37.72 | 0.56 | 0.59 | 0.44 | 0.37 |
| Standard Deviation | -- | 1.08 | 0.62 | -- | 0.62 | 0.67 | 1.05 | 4.24 | 4.74 | 3.31 | 1.04 | 0.84 | 6.15 | 6.70 | 0.39 | 0.34 | 0.32 | 0.23 |
Note. For sex, 0 = female, 1 = male. For ADHD medication use, 0 = not prescribed stimulant medication, 1 = prescribed stimulant medication. For circadian preference, higher scores indicate greater morningness preference. For pubertal development, higher scores indicate more advanced pubertal development. PR = parent-report. SR = adolescent self-report.
*
p < .05.
**
p < .01.
***
p < .001.