This study evaluated the association of sleep duration and irregularity (shifts in sleep duration and wake/bedtimes from weekday to weekend) with baseline level of obesity in youth enrolled in a weight management program. The 288 youth ranged in age from 6 to 18 years old; 61.1% were female, and 52.5% were Caucasian. In adjusted models, shorter sleep duration was significantly related to higher BMI z scores. Two measures of sleep irregularity, bedtime and wake-time shift, were also each related to baseline BMI z scores, but these relationships did not remain significant in adjusted models. In gender-stratified adjusted regression models, shorter sleep duration and greater wake-time shift for females were significantly associated with higher BMI z scores. None of the sleep variables were significantly related to BMI z scores for males in adjusted models. Taken together, the results of this study support the relationship between sleep duration and regularity with level of obesity in a racially diverse sample of predominantly obese, treatment-seeking youth.




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