The Development of Sleep Questionnaires Thai Version (ESS, SA-SDQ, and PSQI): Linguistic Validation, Reliability Analysis and Cut-Off Level to Determine Sleep Related Problems in Thai Population
Thanitpong Methipisit MD*, Mathirut Mungthin MD, PhD**, Sansanee Saengwanitch MD*, Polasun Ruangkana MD*, Yotin Chinwarun MD, PhD*, Prajej Ruangkanchanasetr MD***, Suthee Panichkul MD****, Supak Ukritchon MSc****, Prasit Mahakit MD*****, Pasiri Sithinamsuwan MD*
Affiliation : * Division of Neurology, Department of Medicine, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand ** Department of Parasitology, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand *** Division of Nephrology, Department of Medicine, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand **** Office of Research Development, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand ***** Department of Ear Nose Throat, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand
Background : The Epworth Sleepiness Scale (ESS), Sleep Apnea Scale of Sleep Disorders Questionnaire (SA-SDQ), and
Pittsburgh Sleep Quality Index (PSQI) are widely used in English speaking countries for sleep problem screening. However,
there is no officially validated Thai-version of sleep questionnaires available.
Objective : To provide standard Thai version of three sleep questionnaires and find cut-off level to screening sleep problems
in Thai population.
Material and Method: We used Mapi Research Institute Methods for translation from original language to Thai questionnaire.
Then, test-retest reliability analysis was performed. Finally, we collected data from patients who underwent polysomnography
in Phramongkutklao Sleep Lab Centre between June and August 2011. Cut-off value to screen population at risk for
sleep-related disorder was researched.
Results : The questionnaires were translated with very good inter-rater agreement. Cut-off of ESS, SA-SDQ, and PSQI
suggested sleep disorders would be 9, 27, and 6.5 respectively.
Conclusion : Sleep disorder questionnaires including ESS, SA-SDQ, and PSQI were translated into Thai with high validity,
reliability, and accuracy.
Keywords : ESS, SASDQ, PSQI, Thai-version, Polysomnography, OSA
