Table 1.
Participant characteristics
| Female, n (%) | 108 (57) |
| Male, n (%) | 81 (43) |
| Age in years (range 8, 12.9), mean (SD) | 10.50 ± 1.39 |
| Race/ethnicity, n (%) | |
| White | 51 (27) |
| Latino/Hispanic | 94 (50) |
| Asian/Pacific Islander | 18 (10) |
| African–American | 5 (2) |
| Other/mixed | 20 (11) |
| Total household income, n (%) | |
| $14,999 or less | 33 (17) |
| $15,000–24,999 | 30 (16) |
| $25,000–49,999 | 34 (18) |
| $50,000–199,999 | 33 (18) |
| Don't know or I prefer not to answer | 58 (31) |
| Parent maximum level of education, n (%) | |
| Less than high school | 34 (18) |
| High school graduate or some college | 15 (8) |
| Technical or associate's degree | 78 (41) |
| Bachelor's degree† | 61 (32) |
| Anthropometric measures‡, mean (SD) | |
| Per cent over 50th percentile (per cent overweight) | 71.34 (27.21) |
| Per cent over 95th percentile | 26.55 (20.05) |
| BMI (kg m−2) | 29.24 (5.04) |
| BMI z‐score | 2.24 (0.31) |
| BMI percentile | 98.38 (1.21) |
| Waist circumference (cm) | 95.63 (12.24) |
| Triceps skin‐fold thickness (mm) | 30.26 (4.06) |
| Total nights of accelerometer data per participant (range 3, 15), mean (SD) | 7.0 (1.4) |
| Weekday only§ | 4.92 (0.99) |
| Weekend only | 2.08 (0.61) |
| Accelerometer‐measured sleep duration, mean (SD) | |
| Overall (h) | 9.13 (0.68) |
| Weekday night (h) | 9.07 (0.76) |
| Weekend night | 9.26 (1.00) |
| Accelerometer‐measured sleep timing, mean (SD) | |
| Weekday bedtime (h:min) | 10:09 PM (0:51) |
| Weekday wake time (h:min) | 7:13 AM (0:49) |
| Weekend bedtime (h:min) | 10:55 PM (1:05) |
| Weekend wake time (h:min) | 8:10 AM (1:12) |
| Accelerometer‐measured sleep variability, mean (SD) | |
| Weekday sleep duration (h) | 0.88 (0.55) |
| Weekday bedtime (h) | 0.69 (0.40) |
| Weekday wake time (h) | 0.63 (0.47) |
| Weekend sleep duration (h) | 1.09 (0.84) |
| Weekend bedtime (h) | 0.79 (0.72) |
| Weekend wake time (h) | 0.80 (0.67) |
| Parent‐reported sleep duration, mean (SD) | |
| School¶ night (h) | 9.56 (0.73) |
| Non‐school night (h) | 9.92 (1.06) |
| Parent‐reported sleep timing, mean (SD) | |
| School night bedtime (h:min) | 9:19 PM (0:43) |
| School night wake time (h:min) | 6:52 AM (0:27) |
| Non‐school night bedtime (h:min) | 10:20 PM (0:53) |
| Non‐school night wake time (h:min) | 8:16 AM (1:12) |
None of the parents had a master's, professional, or doctoral degree.
Distribution of age‐specific and sex‐specific body weight based on Centers for Disease Control and Prevention values. One individual, not included in N = 188, was missing anthropometric measurements.
Weekday = Sunday night through Thursday night; weekend = Friday night and Saturday night; parent‐reported values are reported in the table above as ‘school’ and ‘non‐school night’ to reflect the way the question was asked in the survey.
‘School’ and ‘non‐school’ night correspond to weekday and weekend night, respectively. Similarly, bedtime and wake time correspond to accelerometer‐measured sleep onset and sleep offset.
BMI, body mass index; SD, standard deviation.