Table 1.

Sleep-50 questionnaire with optimal cut-off values and scoring procedures.

Sleep disorder	Items	Optimal cut-off values
Obstructive sleep apnea	1-8	Total of these items ≥15
Insomnia	9-16	Total of these items ≥19
Narcolepsy	17-21	Total of these items ≥7
Restless legs/periodic limb movement disorder (RLS/PLMD)	22-25	Total of these items ≥7
Circadian rhythm disorder	26-28	Total of these items ≥8
Sleepwalking	29-31	Total of these items ≥7
Nightmares	32-35	Item 32 ≥3 and total of 33-35 items ≥9