Predicted BMI distributions at wave 0 and wave 7 by gender. The dashed line represents the BMI distribution if all adolescents slept for 10 hours per day, and the solid line represents the BMI distribution if all adolescents slept for 8.1 hours per day at age 14 and 7.5 hours per day at age 18 (age-specific average hours of sleep, Table 1).
Data presented are coefficients and 95% CIs in parentheses. Wave is coded 0, 1, 2, 3, 4, 5, 6, and 7 to represent each 6-month follow-up, and thus the wave coefficients are interpreted as change in BMI per 6 months. Sleep is modeled in hours per day, and thus the sleep coefficients are interpreted as the change in BMI for each additional hour spent sleeping.