Development and first validation of the COPD Assessment Test
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TLDR
The aim of the present study was to develop a short validated patient-completed questionnaire, the COPD Assessment Test (CAT), assessing the impact of COPD on health status, which has good measurement properties, is sensitive to differences in state and should provide a valid, reliable and standardised measure of COPd health status with worldwide relevance.Abstract:
There is need for a validated short, simple instrument to quantify chronic obstructive pulmonary disease (COPD) impact in routine practice to aid health status assessment and communication between patient and physician. Current health-related quality of life questionnaires provide valid assessment of COPD, but are complex, which limits routine use. The aim of the present study was to develop a short validated patient-completed questionnaire, the COPD Assessment Test (CAT), assessing the impact of COPD on health status. 21 candidate items identified through qualitative research with COPD patients were used in three prospective international studies (Europe and the USA, n51,503). Psychometric and Rasch analyses identified eight items fitting a unidimensional model to form the CAT. Items were tested for differential functioning between countries. Internal consistency was excellent: Cronbach's a50.88. Test re-test in stable patients (n553) was very good (intra-class correlation coefficient 0.8). In the sample from the USA, the correlation with the COPD-specific version of the St George's Respiratory Questionnaire was r50.80. The difference between stable (n5229) and exacerbation patients (n567) was five units of the 40-point scale (12%; p,0.0001). The CAT is a short, simple questionnaire for assessing and monitoring COPD. It has good measurement properties, is sensitive to differences in state and should provide a valid, reliable and standardised measure of COPD health status with worldwide relevance.read more
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Classification of chronic obstructive pulmonary disease severity according to the new Global Initiative for Chronic Obstructive Lung Disease 2011 guidelines: COPD assessment test versus modified Medical Research Council scale.
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The physical, mental, and social impact of COPD in a population-based sample: results from the Longitudinal Aging Study Amsterdam.
Frits M.E. Franssen,Frits M.E. Franssen,Dionne E. Smid,Dorly J. H. Deeg,Martijn Huisman,Martijn Huisman,Jan Poppelaars,Jan Poppelaars,Emiel F.M. Wouters,Martijn A. Spruit,Martijn A. Spruit +10 more
TL;DR: In a population-based sample, subjects with COPD had a reduced physical performance, a more impaired disease-specific health status and were more socially deprived compared to non-COPD subjects.
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Evolution of the COPD Assessment Test score during chronic obstructive pulmonary disease exacerbations: determinants and prognostic value.
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TL;DR: The CAT detects early health status improvement during severe COPD exacerbations and its initial worsening and recovery pattern are related to lung function and recurrent hospitalizations.
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