Table 1. Baseline Self-reported Demographic Characteristics of START Actigraphy Substudy Participants by Condition.
| Characteristic | Study group, No. (%)a | P value | |
|---|---|---|---|
| Delayed-start schools (n = 214) | Comparison schools (n = 241) | ||
| Biological sex | |||
| Female | 108 (50.5) | 117 (48.5) | .80 |
| Male | 101 (47.2) | 118 (49.0) | |
| Prefer not to answer | 4 (1.9) | 3 (1.2) | |
| Hispanic or Latino ethnicity | 7 (3.3) | 6 (2.5) | .63 |
| Race | |||
| Native American | 2 (0.9) | 1 (0.4) | <.001 |
| Asian | 16 (7.5) | 4 (1.7) | |
| Black | 7 (3.3) | 0 | |
| White | 172 (80.4) | 224 (92.9) | |
| Multiracial | 12 (5.6) | 9 (3.7) | |
| Unknown or not reported | 4 (1.9) | 0 | |
| Free or reduced-price lunch eligible | |||
| No | 171 (79.9) | 172 (71.4) | .08 |
| Yes | 14 (6.5) | 16 (6.6) | |
| Do not know | 28 (13.1) | 50 (20.7) | |
| ≥1 Parent completed college | 191 (89.3) | 179 (74.3) | <.001 |
a
Percentages may not total 100 owing to missing responses. Data are from the START study, spring 2016 through spring 2018.