Table 3.
Gender-and ethnic-specific multivariable-adjusteda mean BMI (95% confidence interval) estimates according to category of sleep duration
| < 7 hr/d | 7–9 hr/d | >9 hr/d | p-value, interaction | |
|---|---|---|---|---|
| Total sample, n | 243 | 1,338 | 425 | |
| Mean BMI (95% CI) | 26.8 (26.0, 27.6) | 26.2 (25.9, 26.6) | 25.9 (25.3, 26.5) | |
| p-valueb | 0.072 | ref | 0.39 | |
| Gender | 0.31 | |||
| Male, n | 140 | 642 | 173 | |
| Mean BMI (95% CI) | 27.9 (26.9, 28.9) | 26.5 (26.1, 27.0) | 26.2 (25.2, 27.1) | |
| p-value | 0.012 | ref | 0.49 | |
| Female, n | 103 | 696 | 252 | |
| Mean BMI (95% CI) | 25.6 (24.4, 26.9) | 26.0 (25.5, 26.5) | 25.6 (24.8, 26.4) | |
| p-value | 0.95 | ref | 0.40 | |
| Ethnicity | 0.005 | |||
| White, n | 102 | 725 | 177 | |
| Mean BMI (95% CI) | 27.1 (26.0, 28.1) | 25.9 (25.5, 26.3) | 25.1 (24.3, 25.8) | |
| p-value | 0.0026 | ref | 0.058 | |
| Black, n | 52 | 196 | 100 | |
| Mean BMI (95% CI) | 28.5 (25.9, 31.0) | 26.8 (25.6, 28.1) | 25.9 (23.9, 27.9) | |
| p-value | 0.13 | ref | 0.46 | |
| Hispanic, n | 13 | 83 | 16 | |
| Mean BMI (95% CI) | 28.3 (21.7, 35.0) | 28.6 (26.2, 31.0) | 32.4 (24.1, 40.7) | |
| p-value | 0.44 | ref | 0.40 | |
| Asian, n | 49 | 227 | 91 | |
| Mean BMI (95% CI) | 25.5 (23.5, 27.5) | 25.8 (24.9, 26.7) | 25.9 (24.5, 27.2) | |
| p-value | 0.79 | ref | 0.93 | |
| Other, n | 23 | 91 | 37 | |
| Mean BMI (95% CI) | 27.4 (24.0, 30.7) | 26.5 (25.1, 27.9) | 31.0 (28.6, 33.3) | |
| p-value | 0.081 | ref | 0.0028 |
a
Adjusted for age and race, and gender in the total sample analysis, student status, college graduate, parental status, ability to live on income, depressive symptoms, depression diagnosis (ever), breakfast consumption, fast food consumption, total energy intake, consumption of sugar-sweetened beverages, MVPA, screen time.
b
P-values correspond to separate pair-wise comparisons of <7 hours/day to 7–9 hours/day and of >9 hours/day to 7–9 hours/day.