Table 3.
Regression Models Predicting Depressive Symptoms (CES-D Scorea) from TST School and Social Jetlag (N = 3058)
| UNADJUSTED |
ADJUSTEDe |
|||||
|---|---|---|---|---|---|---|
| b | 95% CIb | ΔR2 | b | 95% CIb | ΔR2 | |
| Overall (Model 1) | ||||||
| TST school (hrs)c | −.08*** | −.10, −.05 | .024 | −.08*** | −.11, −.06 | .030 |
| Sex (female=ref) | −.13*** | −.17, −.09 | .012 | −.13*** | −.17, −.09 | .012 |
| TST school (hrs)c * Sex | .07*** | .03, .10 | .010 | .07*** | .04, .10 | .011 |
| Social jetlag (hrs)cd | .05*** | .02, .07 | .012 | .04*** | .02, .06 | .010 |
| Social jetlag (hrs)cd * Sex | −.03* | −.06, .003 | .003 | −.03* | −.06, .002 | .003 |
| Females (Model 2) | ||||||
| TST schoolc (hrs) | −.08*** | −.10, −.05 | .022 | −.08*** | −.11, −.06 | .027 |
| Social jetlagcd (hrs) | .05*** | .02, .07 | .011 | .04*** | .02, .06 | .009 |
| Males (Model 3) | ||||||
| TST schoolc (hrs) | −.01 | −.03, .01 | <.001 | −.01 | −.03, .01 | .001 |
| Social jetlagcd (hrs) | .01 | −.01, .03 | .001 | .01 | −.01, .03 | .001 |
CES-D subscale range: 0=low depressive symptoms; 3=high depressive symptoms (Perreira et al., 2005).
95% confidence interval for unstandardized coefficient, b.
Mean-centered.
Calculated as | midpoint of sleep on weekend nights – midpoint of sleep on school nights | (Wittmann et al., 2006).
Adjusted for reported race/ethnicity, age in years, body mass index percentile, number of other children below the age of 18 in the household, number of hours youth works outside home weekly, annual household income, youth relationship to primary caregiver (PCG), PCG married/cohabiting with youth’s biological parent, PCG employment status, PCG education level, and PCG meeting clinical depression criteria for past year.
ref=reference group; TST—total sleep time.
p < .01, two-tailed.
p < .001, two-tailed.