Table 1.
Demographic characteristics of the study sample1
| Characteristics | Overall (N=324) | Non-Hispanic White (N=257) | Racial/Ethnic Minority (N=67) | P |
|---|---|---|---|---|
| Age (years) | 16.7 (2.3) | 16.7 (2.4) | 16.9 (1.9) | 0.38 |
| Male (%) | 51.9 | 53.7 | 44.8 | 0.19 |
| Race/Ethnicity (%) | ||||
| Non-Hispanic White | 79.3 | 100.0 | 0.0 | |
| African American | 13.0 | 0.0 | 62.7 | |
| Hispanics | 4.6 | 0.0 | 22.4 | N/A |
| Hawaiian/Asian | 2.2 | 0.0 | 10.4 | |
| American Indian | 0.9 | 0.0 | 4.5 | |
| BMI percentile | 65.9 (28.2) | 63.7 (29.2) | 73.9 (22.7) | <0.01 |
| HSD (hours) | 7.00 (0.83) | 7.07 (0.80) | 6.72 (0.91) | <0.01 |
| HSV (hours) | 1.18 (0.60) | 1.14 (0.58) | 1.32 (0.64) | 0.03 |
| Total caloric intake (kcal/day) | 1765.4 (658.4) | 1797.3 (652.6) | 1643.0 (671.2) | 0.09 |
| Total fat intake (g/day) | 63.7 (26.3) | 65.1 (26.2) | 58.1 (25.8) | 0.05 |
| Carbohydrate intake (g/day) | 232.4 (88.8) | 236.1 (87.3) | 218.5 (93.5) | 0.15 |
| Protein intake (g/day) | 70.4 (27.7) | 71.7 (27.8) | 65.4 (27.2) | 0.10 |
| % High School graduate or above | 91.9 (3.0) | 92.2 (2.7) | 90.9 (3.6) | <0.01 |
| Household median income ($) | 64806 (11132) | 66005 (10583) | 60532 (12021) | <0.01 |
1
The results were expressed as mean (SD) and percentage for continuous and categorical variables, respectively. HSD: Habitual Sleep Duration. HSV: Habitual Sleep Variability.