Table 4.
Descriptive Statistics and Bivariate Correlations for Variables of Interest
| M(SD) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
|---|---|---|---|---|---|---|---|---|
| 1. Cumulative Risk Sleep efficiency (%) | 1.91 (1.48) | – | −.15** | −.17*** | −.12* | .08 | −.03 | .29*** |
| 2. BISQ 9 months | 92.09 (10.23) | −.15* | – | .41*** | .38*** | −.05 | .06 | −.17*** |
| 3. PT 9 months | 97.10 (3.93) | −.18** | .43*** | – | .47*** | .04 | .10* | −.21*** |
| 4. PT 12 months | 97.62 (2.85) | −.13* | .28*** | .58*** | – | .05 | .13* | −.19*** |
| Socioemotional development | ||||||||
| 5. PT SCG: 9 months | 0.68 (0.08) | .10 | −.09 | .02 | .08 | – | .70*** | .05 |
| 6. PT SCG: 12 months | 0.76 (0.09) | −.05 | .03 | .07 | .12* | .71*** | – | −.05 |
| 7. BITSEA: 12 | 7.59 (5.10) | .28*** | −.21** | −.25*** | −.22*** | .08 | −.03 | – |
Note. BISQ = Brief Infant Sleep Questionnaire – Expanded Version. PT = PediaTrac, SCG = Social/Communication/Cognition Domain. BITSEA = Brief Infant-Toddler Social-Emotional Assessment. Values above the diagonal are pooled estimates of 20 data sets created with multiple imputation and values below the diagonal and the descriptive statistics are from the original data.
*
p < .05.
**
p < .01.
***
p < .001.