title: Validity and reliability of Sleep Quality Scale in subjects with obstructive sleep apnea syndrome.
abstract: OBJECTIVE
  The present study aimed to evaluate the validity and reliability of Sleep Quality Scale (SQS) in subjects with obstructive sleep apnea syndrome (OSAS).
  
  
  METHODS
  The known group technique was used for construct validity. The study sample was composed of 40 persons with OSAS and 37 normal subjects. OSAS was defined as an apnea-hypopnea index (AHI) of > or =5 plus an Epworth Sleepiness Scale (ESS) score of >10. Control group was composed of subjects who had no history of depression and sleep problems as identified by self-report and polysomnography. A Cronbach's alpha coefficient was used for internal consistency.
  
  
  RESULTS
  The total SQS score of the OSAS subjects was significantly higher than that of the normal subjects. The SQS score homogeneity was high with a Cronbach's alpha coefficient of 0.90 in all subjects, 0.87 in the OSAS subjects, and 0.70 in the normal subjects.
  
  
  CONCLUSIONS
  SQS was confirmed to be an instrument with validity and high reliability for measuring sleep quality in OSAS subjects.
authors.affiliation: Department of Nursing, Korea Nazarene University, Cheonan-si, Chungnam, Republic of Korea.
authors.forename: Hyeryeon
authors.initials: H
authors.lastname: Yi
authors.forename: Kyungrim
authors.initials: K
authors.lastname: Shin
authors.forename: Jinyoung
authors.initials: J
authors.lastname: Kim
authors.forename: Jeongsun
authors.initials: J
authors.lastname: Kim
authors.forename: JungBok
authors.initials: J
authors.lastname: Lee
authors.forename: Chol
authors.initials: C
authors.lastname: Shin
mesh_terms: D000328:Adult; D003863:Depression / Q000523:psychology; D006970:Disorders of Excessive Somnolence / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D011594:Psychometrics / Q000706:statistics & numerical data; D011788:Quality of Life / Q000523:psychology; D015203:Reproducibility of Results; D012803:Sick Role; D020181:Sleep Apnea, Obstructive / Q000523:psychology*; D012894:Sleep Stages; D011795:Surveys and Questionnaires