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Adolescent sleep, school start times, and teen motor vehicle crashes

Page history last edited by Dolores Skowronek 6 years, 5 months ago

Danner, F., & Phillips, B. (2008). Adolescent sleep, school start times, and teen motor vehicle crashes. Journal of Clinical Sleep Medicine, 4(6), 536-7.

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Study Objectives

To assess the effects of delayed high-school start times on sleep and motor vehicle crashes.



The sleep habits and motor vehicle crash rates of adolescents from a single, large, county-wide, school district were assessed by questionnaire before and after a 1-hour delay in school start times.



Average hours of nightly sleep increased and catch-up sleep on weekends decreased. Average crash rates for teen drivers in the study county in the 2 years after the change in school start time dropped 16.5%, compared with the 2 years prior to the change, whereas teen crash rates for the rest of the state increased 7.8% over the same time period.



Later school start times may both increase the sleep of adolescents and decrease their risk of motor vehicle crashes.


MeSH Terms
    Accidents, Traffic/statistics & numerical data*
    Automobile Driving/statistics & numerical data*
    Data Collection
    Schools/organization & administration*
    Time Factors



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