. Author manuscript; available in PMC: 2018 Dec 1.

Published in final edited form as: Sleep Health. 2017 Oct 16;3(6):444–450. doi: 10.1016/j.sleh.2017.09.004

Table 2.

Model-Adjusted Estimated Means of Bedtime, Wake Time, and Time in Bed by School Start Time Categories from the Fragile Families and Child Wellbeing Study

	School Start Times
	7:00–7:29 AM		7:30 AM–7:59 AM		8:00 AM–8:29 AM		8:30 AM or Later
	Estimated Mean (SD)		Estimated Mean (SD)		Estimated Mean (SD)		Estimated Mean (SD)
Bedtime (Clock Time)	10:30 PM	(10.45)	10:47 PM	(9.44)	10:43 PM	(7.78)	10:50 PM	(13.65)
Wake Time (Clock Time)	6:08 AM	(7.93)	6:21 AM	(7.14)	6:38 AM	(5.90)	7:05 AM	(10.32)
Time in Bed (H:MM)	7:24	(13.40)	7:31	(12.17)	7:45	(9.98)	8:09	(17.37)

Notes. Standard Deviations (SD) are in minutes. N=413; 1,560, 1,557, and 1,555 school days’ observations clustered within 413 teens were used for the multilevel models for bedtime, wake time, and time in bed, respectively (differences were due to missing responses in the variables). The models adjusted for age, sex, race, household income, primary caregiver’s education, and school type. Estimates reflect the interpretation of the Betas and Intercepts available in Table 3.