Table 2.
Sample Characteristics
| Characteristica | Total Sample (N = 137) | Total Sample Range |
|---|---|---|
| Age (years) | 12.5 ± 2.6 | 8.0-17.0 |
| Sex (% female) | 54.0 | |
| Race/Ethnicity (%) | ||
| Hispanic or Latino | 6 | |
| Asian | 12.7 | |
| Black or African American | 28.4 | |
| Multiple Races | 7.5 | |
| White | 47 | |
| Unknown | 0.7 | |
| Children’s Depressive Inventory-2 Total Score | 6.6 ± 5.0 | 0.0 - 27.0 |
| Mild Depressive Symptoms (%) | 3.6 | |
| Moderate Depressive Symptoms (%) | 2.2 | |
| Severe Depressive Symptoms (%) | 0.7 | |
| Socioeconomic Status (SES) Quartiles (%) | ||
| First (lowest SES) | 9.8 | |
| Second | 30.3 | |
| Third | 36.4 | |
| Fourth (highest SES) | 23.5 | |
| Baseline Fat Mass (kg) | 15.3 ± 8.9 | 3.8 - 47.0 |
| 1-Year Fat Mass (kg) | 17.0 ± 10.0 | |
| BMIz Score | 0.5 ± 1.0 | −4.4 |
| Healthy weight (%) | 71.5 | |
| Overweight (%) | 12.4 | |
| Obesity (%) | 16.1 | |
| Time of Year Completing the Protocol (%) | ||
| Winter (December, January, February) | 17.5 | |
| Spring (March, April, May) | 32.1 | |
| Summer (June, July, August) | 25.5 | |
| Fall (September, October, November) | 24.8 | |
| Average Weekly Sleep Duration (hr/night) | 7.2 ± 0.9 | 4.6 - 8.8 |
| Weekend Catch-Up Sleep (hr/night) | 0.3 ± 1.0 | −1.5 - 3.7 |
| Within-Subject Sleep Duration Variability | 1.2 ± 0.5 | 0.4 - 3.7 |
| Bedtime Shift (hr) | 0.9 ± 0.7 | 0.0 - 3.2 |
| Waketime Shift (hr) | 1.3 ± 1.1 | 0.0 - 5.3 |
| Social Jet Lag (hr) | 1.1 ± 1.0 | 0.0 - 7.3 |
| Bedtime (hh:mm ± hr) | 11:31PM ± 1.3 | 8:52PM - 3:21AM |
| Waketime (hh:mm ± hr) | 7:53AM ± 1.1 | 5:02AM - 11:31AM |
| Sleep Midpoint (hh:mm ± hr) | 3:46AM ± 1.1 | 1:40AM - 7:26AM |
a
Values presented are mean ± standard deviation, unless otherwise noted as percentage. Four participants were missing data for socioeconomic status.