Sleep characteristics of study participants.

<p>Values are means ± SD,</p>#<p>median and interquartile range for skewed variables, or %. Skewed variables were log-transformed prior to analysis. <i>P</i>-values for <i>t</i>-tests or *Fisher exact test are depicted and significant <i>p</i>-values (<0.05) are bolded.</p>*<p>Fisher exact test including all races;</p>**<p>Fisher exact test excluding “Other races”.</p>1<p>Sleep duration differed on working <i>vs.</i> non-working days in Morning (diary and actigraphy: <i>p</i><0.001) and in Evening chronotypes (diary: <i>p</i> = 0.053; actigraphy: <i>p</i> = 0.005).