Means, standard deviation and range of continuous demographic variables.
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aAssessed immediately after study enrolment, from the Horne Ostberg questionnaire [70] in all 170 subjects.
bAssessed immediately after study enrolment, from the Epworth Sleepiness Scale [71] in 132 subjects. Scores of greater than 10 are suggestive of high daytime sleepiness.
cAssessed immediately after study enrolment, from the Pittsburgh Sleep Quality Index [72] in 132 subjects. A score of greater than 5 is suggestive of a sleep disorder.
dNumber of days on fixed sleep schedule prior to phase assessment.
eSunrise to sunset times in Chicago (US Naval Observatory).
fSelf-reported habitual use prior to start of study.
创建时间：
2013-02-21
