title: [COPD disability index (CDI) - a new instrument to assess COPD-related disability].
abstract: The aim of the present study was to evaluate anew scale for assessing COPD-related disability. The scale is an adaptation of the pain disability index (PDI), which is a standard instrument in diagnosing disability in chronic pain patients. An 11-point rating scale is used to assess disability in seven different areas of life. The present study comprised a sample of 143 COPD patients (GOLD II-IV) and 105 spouses. A principal axes factor analysis revealed a one-factor solution explaining 63.4% of the variance. In the present sample, the scale showed good internal consistency (patients' self-report: Cronbach's alpha=0.92, spouses' report: Cronbach's alpha=0.91). The scale further demonstrated high correlations with questionnaires assessing related constructs [St. George's Respiratory Questionnaire (SGRQ): Pearson's correlation coefficients r=0.59 to 0.83, p<or=0.01; European Quality of Life Questionnaire (EuroQol): r=-0.59, p<or=0.01] and functional parameters (Shuttle-Walk-Distance: r=-0.47, p<or=0.01; FEV(1)% pred: r=-0.26, p<or=0.01), as well as low correlations with questionnaires assessing distant constructs [social support (F-SozU): r=-0.09, social strain (F-SozU): r=0.17, p<or=0.05, satisfaction with relationship: r=-0.10], suggesting good discriminant and convergent validity. The COPD disability index is a short, user-friendly, reliable and valid measure to assess COPD-related disability.
authors.affiliation: Universität Marburg, Fachbereich Psychologie, AG Klinische Psychologie und Psychotherapie, Marburg. kuehl@staff.uni-marburg.de
authors.forename: K
authors.initials: K
authors.lastname: Kühl
authors.forename: W
authors.initials: W
authors.lastname: Schürmann
authors.forename: W
authors.initials: W
authors.lastname: Rief
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004185:Disability Evaluation; D005260:Female; D005858:Germany; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000145:classification* / Q000175:diagnosis*; D011788:Quality of Life; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires