Table 1.
Means, Percentages, and Confidence Intervals (CIs) for All Study Variables.
| Study variables | Mean/percent | 95% CI |
|---|---|---|
| Dependent variables | ||
| Depressive symptoms 0 (low) to 18 (high) | 2.47 | [2.38, 2.55] |
| Depressive symptoms (logged) | .86 | [0.84, 0.88] |
| Shift work | ||
| Day | 80.27% | — |
| Evening | 3.28% | — |
| Night | 4.17% | — |
| Rotating | 4.41% | — |
| Irregular | 7.86% | — |
| Sleep health (mediators) | ||
| Short sleep weekdays (⩽6 hours) | 44.84% | — |
| Short sleep weekdays (≥7 hours) | 55.16% | — |
| Short sleep weekend (⩽6 hours) | 27.15% | — |
| Short sleep weekend (≥7 hours) | 72.85% | — |
| Insomnia symptoms (1 = yes) | 66.71% | — |
| Insomnia symptoms (0 = no) | 33.29% | — |
| Sleep latency (30–60 minutes) | 22.13% | — |
| Sleep latency (0–29 minutes) | 77.87% | — |
| Control variables | ||
| Women | 49.92% | — |
| Men | 50.08% | — |
| Black | 29.36% | — |
| Hispanic | 18.86% | — |
| White | 51.77% | — |
| Age | 50.29 | [50.26, 50.32] |
| Married | 58.54% | — |
| Not married | 41.46% | — |
| Parents | 81.84% | |
| Non-parents | 18.16% | |
| Caregiver | 9.67% | |
| Non-caregiver | 90.33% | |
| Less than high school degree | 7.49% | — |
| High school degree | 41.51% | — |
| College (1 or more years) | 51.00% | — |
| Income (logged) | 10.75 | [10.71, 10.80] |
| Poor self-rated health | 14.31% | — |
| Good self-rated health | 85.69% | — |
Note. NLSY-79 Cohort, (N = 6372).