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dc.contributor.authorPatte, Karen A.
dc.contributor.authorQian, Wei
dc.contributor.authorCole, Adam G.
dc.contributor.authorFaulkner, Guy
dc.contributor.authorChaput, Jean-Philippe
dc.contributor.authorCarson, Valerie
dc.contributor.authorLeatherdale, Scott T. 20:37:03 (GMT) 00:00:00 (GMT) 20:37:03 (GMT)
dc.descriptionThe final publication is available at Elsevier via� 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
dc.description.abstractBackground To date, no longitudinal population-based studies of school start times have been conducted within Canada. School schedule changes provided an opportunity to examine start times in association with youth sleep, physical activity, and screen use over time. Methods This longitudinal study included grade 9�12 students attending 49 Ontario secondary schools that participated in at least two consecutive years of the COMPASS study (2012�2017). Fixed effects models tested whether differences in within-student change in self-reported sleep duration, moderate-to-vigorous physical activity, and screen time were associated with school start time changes, adjusting for student- (grade, sex, ethnicity, spending money) and school-level covariates (median income, urbanicity, geographical area). Results Thirteen start time changes of 5�10�min were reported. Ten-minute advances at earlier clock times (8:30 AM�8:20 AM; 8:40 AM�8:30 AM) were associated with steeper sleep duration declines than schools with consistent start times but had no effect at later times (9:00 AM�8:50 AM). While sleep change did not differ with 5-min�delays, 10-min�delays (8:50 AM�9:00 AM) were associated with additional sleep (23.7�min). Apart from one school that shifted from 8:30 AM to 8:35 AM, in which screen time and physical activity decreased more steeply, no effect was found for screen time, and 5-min�delays were associated with more physical activity (10.9�min) and advances with less activity (_8.0�min). Conclusions Results support start time delays as a valuable strategy to help ameliorate sleep debt among youth. Interference with physical activity or increased screen time appear unlikely with modest schedule changes. Potential adverse impacts on sleep require consideration with 10-min�advances.en
dc.description.sponsorshipCanadian Institutes of Health Research Institute of Nutrition, Metabolism and Diabetes [grant OOP-110788]en
dc.description.sponsorshipCanadian Institutes of Health Research Institute of Population and Public Health [grant MOP-114875]en
dc.description.sponsorshipCanadian Institutes of Health Research Project Grant [grant PJT-148562]en
dc.description.sponsorshipCanadian Institutes of Health Research New Investigator Salary Awarden
dc.description.sponsorshipCanadian Institutes of Health Research Doctoral Research Awarden
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectphysical activityen
dc.subjectschool start timeen
dc.subjectscreen timeen
dc.subjectsleep durationen
dc.titleSchool start time changes in the COMPASS study: associations with youth sleep duration, physical activity, and screen timeen
dcterms.bibliographicCitationPatte, K. A., Qian, W., Cole, A. G., Faulkner, G., Chaput, J.-P., Carson, V., & Leatherdale, S. T. (2018). School start time changes in the COMPASS study: associations with youth sleep duration, physical activity, and screen time. Sleep Medicine.
uws.contributor.affiliation1Faculty of Applied Health Sciencesen
uws.contributor.affiliation2School of Public Health and Health Systemsen

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