title: [Reliability and validity of Turkish version of COPD assessment test].
abstract: BACKGROUND
  This study is aimed to evaluate the reliability and validity of the Turkish version of chronic obstructive pulmonary disease (COPD) Assessment Test (CAT) in seven centers.
  
  
  METHODS
  321 patients between 4-75 years of age, diagnosed and staged by Global Initiative for Obstructive Lung Disease (GOLD) 2011 criteria were included. The Breathlessness, Cough, Sputum scale (BCSS), mMRC (Modified Medical Research Council ) dyspnea index, St. George Respiratory Questionnaire (SGRQ), CAT and Short Form-36 (SF-36) were used concurrently. In the statistical analyses, internal consistency, item-total score correlation, explorative factor analysis, correlation with other scales were calculated.
  
  
  RESULTS
  The mean age was 62.4 ± 8.9 years and 89.7% of the patients were male (n= 288). Mean FEV1% was 51.9 ± 19.2 and most of the patients were in Stage 3. CAT total score was 17.8 ± 9.5. In the internal consistency, Cronbach alpha coefficient was found as 0.9116 and item-total score correlation coefficients were between 0.62-0.79 and all were statistically significant (p< 0.0001). The correlation of the test-retest score calculated after two weeks with the initial score was 0.96 (p< 0.0001). In the structural validity, factor analysis with principle component analysis and varimax rotation was performed. One factor solution was achieved with eigenvalue of 4.956 and it represented 61.9% of the total variance. All the items were contained in the factor and the factor loads were between 0.71-0.85. The correlation coefficients of CAT with other indexes were moderate to good. The discrimination of CAT among disease stages has been shown to be significant (p< 0.0001) and a significant correlation was found with pulmonary function tests (p< 0.0001).
  
  
  CONCLUSIONS
  It is demonstrated The Turkish version of COPD Assessment Tool is reliable and valid.
authors.affiliation: Department of Chest Diseases, Faculty of Medicine, Celal Bayar University, Manisa, Turkey. arzuyo@hotmail.com
authors.forename: Arzu
authors.initials: A
authors.lastname: Yorgancıoğlu
authors.forename: Mehmet
authors.initials: M
authors.lastname: Polatlı
authors.forename: Ömer
authors.initials: Ö
authors.lastname: Aydemir
authors.forename: Nilgün
authors.initials: N
authors.lastname: Yılmaz Demirci
authors.forename: Gamze
authors.initials: G
authors.lastname: Kırkıl
authors.forename: Sibel
authors.initials: S
authors.lastname: Naycı Atış
authors.forename: Nurdan
authors.initials: N
authors.lastname: Köktürk
authors.forename: Atilla
authors.initials: A
authors.lastname: Uysal
authors.forename: Selim Erkan
authors.initials: SE
authors.lastname: Akdemir
authors.forename: Eylem Sercan
authors.initials: ES
authors.lastname: Özgür
authors.forename: Gonca
authors.initials: G
authors.lastname: Günakan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis*; D015203:Reproducibility of Results; D012129:Respiratory Function Tests; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires / Q000592:standards*; D055815:Young Adult