Table 1.
Descriptive Statistics from Analytical Sample (N = 3,060) of Age 15 Wave of the Fragile Families and Child Wellbeing Study (FFCWS)
| n or Mean | % or SD | |
|---|---|---|
| Youth | ||
| Sexa | ||
| Female | 1473 | 48.1% |
| Male | 1587 | 51.9% |
| Race/ethnicity | ||
| Black/African American, non-Hispanic/Latino | 1413 | 46.2% |
| Hispanic and/or Latino, any race | 736 | 24.1% |
| White/Caucasian, non-Hispanic/Latino | 535 | 17.5% |
| Other,b mixed, or none | 376 | 12.3% |
| Age (yrs) | 15.59 | .77 |
| Household arrangements (youth lives with) | ||
| Biological mother | 2691 | 87.9% |
| Biological father | 224 | 7.3% |
| Non-parent | 145 | 4.7% |
| Household income | $62,550 | $65,315 |
| Eating behaviours and body mass index (BMI) | ||
| Breakfast (≥ 4 days of school week) | 1598 | 52.2% |
| Green vegetables or fruit (all 7 days of week) | 930 | 30.4% |
| Fast food (≥ 2 days weekly) | 1487 | 48.6% |
| Sweetened drinks (≥ 2 daily) | 1895 | 61.9% |
| BMI | 24.02 | 5.73 |
| BMI percentilec | 68.02 | 27.89 |
| Sleep and social jetlag measures | ||
| Bedtime | ||
| School night (Sun-Thurs) | 22:22 | 1.13 |
| Weekend night (Fri-Sat) | 0:23 | 1.67 |
| Wake time | ||
| School morning (Mon-Fri) | 6:21 | .86 |
| Weekend morning (Sat-Sun) | 9:46 | 1.79 |
| Sleep duration (hrs) | ||
| School night | 7.98 | 1.24 |
| Weekend night | 9.38 | 1.94 |
| Social jetlag (hrs)d | 2.75 | 1.29 |
a
Data collected at birth.
b
Other category includes Asian, Central American/Caribbean, Native American/Alaska Native, and/or Native Hawaiian/Pacific Islander.
c
Calculated based on 2000 Centers for Disease Control and Prevention (CDC) growth charts, matched for age and sex.(48)
d
| Midpoint of sleep on weekend nights − midpoint of sleep on school nights |.(13)