Table 1.
Bivariate correlations, means, and standard deviations for main study variables and covariates
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. Race/ethnicity | ||||||||||||
| 2. SES | −.40*** | |||||||||||
| 3. Sleep minutes | −.12* | .14** | ||||||||||
| 4. Sleep efficiency | −.03 | .13* | .79*** | |||||||||
| 5. Subjective sleep probs. | .30*** | −.21*** | −.06 | .06 | ||||||||
| 6. BIA scores | −.25*** | .25*** | .01 | .11* | −.11* | |||||||
| 7. SAT scores | −.22*** | .24*** | .01 | .07 | −.23*** | .77*** | ||||||
| 8. Academics (T) | −.25*** | .30*** | .15* | .18** | −.18** | .51*** | .65*** | |||||
| 9. Externalizing (T) | .27*** | −.32*** | −.13* | −.14* | .14** | −.27*** | −.31*** | −.61*** | ||||
| 10. Internalizing (T) | .12* | −.20*** | −.03 | .02 | .08 | −.21*** | −.19** | −.50*** | .54*** | |||
| 11. Externalizing (M) | .05 | −.08 | −.08 | −.10 | .12* | −.21*** | −.18** | −.36*** | .36*** | .24*** | ||
| 12. Internalizing (M) | −.01 | −.07 | −.16** | −.07 | .13** | −.20*** | −.15** | −.22*** | .09 | .28*** | .51*** | |
| M | – | 1.72 | 458.31 | 88.60 | 18.98 | 494.57 | 641.36 | 0.00 | 37.05 | 22.82 | 49.41 | 50.26 |
| SD | – | 1.04 | 56.17 | 7.09 | 5.23 | 10.34 | 41.71 | 1.78 | 12.59 | 7.86 | 8.67 | 8.81 |
| Range | – | .34–4.37 | 228.67–584.86 | 61.41– 99.09 |
10.00– 35.00 |
457.00–521.00 | 545.33–771.67 | −5.73–2.84 | 27.00–80.00 | 15.00–47.00 | 38.00–81.00 | 39.00–81.00 |
SES = socioeconomic status; Probs. = problems; SAT = Stanford Achievement Test; Academics = academic functioning; T = teacher-report; M = mother-report. Race/ethnicity was coded as 0 = white/European American and 1 = black/African American.
*p < .10; **p ≤ .05; ***p < .01.