Wisconsin Sleep Cohort (WSC).

Data are mean ± Standard Error Mean, or percentage. The number of subject used for calculations are shown in parentheses, when different from total sample. RLS* = Presence of RLS “symptoms”, as described in the material and method section. AHI is the apnea hypopnea index calculated as the number of manually scored respiratory events per hour of sleep. BMI is body mass index; PSG is nocturnal polysomnography. TST is total sleep time; WASO is Wake After Sleep Onset. Patients using Positive Airway Pressure therapies, e.g. CPAP were excluded from AHI categories.Wisconsin Sleep Cohort (WSC).