title: Assessing health-related quality of life with the SCOPA-PS in French individuals with Parkinson's disease having undergone DBS-STN: A validation study.
abstract: BACKGROUND
  The aims of this study were to validate the French version of the SCales for Outcomes in Parkinson's Disease-PsychoSocial (SCOPA-PS) in individuals with Parkinson's disease (PD) who underwent deep brain stimulation of the subthalamic nucleus (DBS-STN), to confirm the unifactorial structure of this questionnaire, and to establish its psychometric properties.
  
  
  METHODS
  Routinely used psychological questionnaires (BDI-II, STAI-Y, PDQ-39, UPDRS III) and the SCOPA-PS were used for a cross-sectional observational study of 154 PD patients. SCOPA-PS acceptability, scaling assumption, reliability, ordinal confirmatory factor analysis and validity were assessed.
  
  
  RESULTS
  The ICC for two-week test-retest reliability was 0.88. SEM was 8.42. In confirmatory factor analysis, the one-factor model showed an acceptable fit to the data (Chi(2)/df=2.130; CFI=0.976; RMSEA=0.086). No floor or ceiling effects were observed. Skewness was 0.33. Item-total correlation coefficients ranged from 0.47 to 0.71. Cronbach's alpha was 0.86. SCOPA-PS SI correlated with PDQ-39 SI (rs=0.83) and with state-anxiety and depression (rs=0.56 and 0.69 respectively). The SCOPA-PS SI was higher in more depressed patients and in those with the most severe PD motor symptoms.
  
  
  CONCLUSIONS
  SCOPA-PS French version is a one-factor scale with satisfactory psychometric properties consistent with other language versions. This short scale can be used to evaluate the psychosocial component of QoL in PD patients treated with DBS-STN.
authors.affiliation: Inserm U955, équipe 14, service de neurochirurgie, université Paris-Est, hôpital Henri-Mondor, AP-HP, 94000 Créteil, France; EA 4057, université Paris-Descartes, LPPS, 71, avenue Édouard-Vaillant, 92100 Boulogne-Billancourt, France. Electronic address: soulas.th@gmail.com.
authors.forename: T
authors.initials: T
authors.lastname: Soulas
authors.affiliation: EA 4469, université Paris-Descartes, LATI, 71, avenue Édouard-Vaillant, 92100 Boulogne-Billancourt, France.
authors.forename: M
authors.initials: M
authors.lastname: Storme
authors.affiliation: National Center of Epidemiology and CIBERNED, Carlos III Institute of Health, Madrid, Espagne.
authors.forename: P
authors.initials: P
authors.lastname: Martínez-Martín
authors.affiliation: Inserm U955, équipe 14, service de neurochirurgie, université Paris-Est, hôpital Henri-Mondor, AP-HP, 94000 Créteil, France.
authors.forename: M
authors.initials: M
authors.lastname: Pichlak
authors.affiliation: Inserm U955, équipe 14, service de neurochirurgie, université Paris-Est, hôpital Henri-Mondor, AP-HP, 94000 Créteil, France.
authors.forename: J-M
authors.initials: JM
authors.lastname: Gurruchaga
authors.affiliation: Inserm U955, équipe 14, service de neurochirurgie, université Paris-Est, hôpital Henri-Mondor, AP-HP, 94000 Créteil, France.
authors.forename: S
authors.initials: S
authors.lastname: Palfi
authors.affiliation: Inserm U955, équipe 1, service de neurologie, université Paris-Est, hôpital Henri-Mondor, AP-HP, 94000 Créteil, France.
authors.forename: G
authors.initials: G
authors.lastname: Fénelon
mesh_terms: D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D005602:France; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology*; D011569:Psychiatric Status Rating Scales / Q000592:standards; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires / Q000592:standards
keywords: French version; Parkinson's disease; Quality of life; SCOPA-psychosocial; Unifactorial structure