Demographic and sleep characteristics.

<p>^†Epworth Sleepiness Scale; values missing for 2 subjects</p><p>^§median episode frequency (range); values missing for 2 subjects</p><p>^#number of sleep stage shifts from N3 to wakefulness</p><p>^##apnea-hypopnea index</p><p>^###index of periodic limb movements during sleep</p><p>Demographic and sleep characteristics.