Table 1.
Descriptive Statistics and Correlations for Study Variables
| 1. | 2. | 3. | 4. | 5. | 6. | 7. | 8. | 9. | 10. | |
|---|---|---|---|---|---|---|---|---|---|---|
| 1. SES | - | |||||||||
| 2. Age | −0.09 | - | ||||||||
| 3. WJ-III PV | 0.59** | −0.03 | - | |||||||
| 4. Hispanic | −0.36** | −0.02 | −0.44** | - | ||||||
| 5. Medication | 0.20* | 0.04 | 0.20* | −0.10 | - | |||||
| 6. Male | 0.20* | −0.02 | 0.23* | −0.26* | 0.31** | - | ||||
| 7. Home chaos | −0.09 | 0.13 | −0.07 | 0.09 | 0.17 | −0.03 | - | |||
| 8. Sleep duration | 0.29** | −0.24* | 0.17 | 0.01 | −0.02 | −0.05 | −0.13 | - | ||
| 9. Sleep efficiency | −0.06 | −0.17 | −0.21* | 0.20* | −0.11 | −0.18 | 0.08 | 0.26** | - | |
| 10. AA | 0.32** | 0.01 | 0.50** | −0.23* | 0.06 | 0.12 | −0.07 | 0.07 | 0.08 | - |
| Min | −2.09 | 5.65 | 444.00 | - | 0.00 | - | 1.00 | 477.80 | 63.87 | 415.00 |
| Max | 1.02 | 7.51 | 513.00 | - | 1.00 | - | 3.56 | 631.00 | 91.45 | 503.50 |
| Mean | −0.01 | 6.47 | 472.04 | 0.53 | 0.12 | 0.50 | 2.15 | 561.82 | 81.01 | 454.14 |
| SD | 0.88 | 0.30 | 10.72 | 0.50 | 0.27 | 0.50 | 0.58 | 30.65 | 4.25 | 17.88 |
Note. N = 103. Child’s age is in years. Male is coded as 0=female, 1=male; Hispanic is coded as 0=non-Hispanic, 1=Hispanic. SES=Socioeconomic status; WJ-III PV=Woodcock Johnson III Picture Vocabulary; AA = Academic Achievement, which is a composite of Woodcock Johnson III Applied Problems and Passage Comprehension subtests. SES was calculated as a composite of standardized family income and parent education. Sleep duration is in minutes.
*
p < .05.
**
p < .01.