title: [Development and evaluation of a patient-reported outcome measure of pain-related sleep disturbances for pain clinic patients].
abstract: BACKGROUND
  The purpose of this study was to develop a new tool, the Pain Sleep questionnaire, consisting of 20 items (PS-20) for measuring pain-related sleep disturbances in pain clinic patients, and to examine its reliability and validity.
  
  
  METHODS
  The internal consistency, criterion validity compared with the Medical Outcomes Study 36-item Short-Form Health Survey (SF-36v2), and construct validity of the PS-20 were tested.
  
  
  RESULTS
  A total of 125 patients participated in this study. Cronbach's alpha coefficient was 0.969, indicating good internal consistency. The PS-20 score correlated moderately with the physical component summary of SF-36v2 and correlated weakly with the mental component summary of SF-36v2. From the graphical model using the Akaike information criterion and the Categorical principal component analysis, the items were divided into four domains: physical pain, trouble falling asleep, awakened by pain, and general health problems.
  
  
  CONCLUSIONS
  The PS-20 was shown to be a valid and reliable questionnaire scale for measuring pain-related sleep disturbances among pain clinic patients.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Juntendo University School of Medicine, Tokyo 113-8431.
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Morita
authors.forename: Masako
authors.initials: M
authors.lastname: Iseki
authors.forename: Masataka
authors.initials: M
authors.lastname: Ifuku
authors.forename: Shuji
authors.initials: S
authors.lastname: Komatsu
authors.forename: Ikuhiro
authors.initials: I
authors.lastname: Hidaka
authors.forename: Tokuhide
authors.initials: T
authors.lastname: Doi
authors.forename: Eiichi
authors.initials: E
authors.lastname: Inada
mesh_terms: D000368:Aged; D044466:Asian People; D059026:Diagnostic Self Evaluation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000150:complications*; D018710:Pain Clinics; D015203:Reproducibility of Results; D012893:Sleep Wake Disorders / Q000175:diagnosis* / Q000209:etiology*; D011795:Surveys and Questionnaires