1. CAT score single item analysis in patients with COPD: results from COSYCONET
- Author
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J. Randerath Winfried, Pfeifer Michael, Kenn Klaus, Joachim H. Ficker, Gogol Manfred, Grohé Christian, Höffken Gerd, Zaklina Hinz, Julia Tobias, Henke Markus, Teschler Helmut, Welte Tobias, Benjamin Waschki, Buhl Roland, Paul W. Jones, Kirsten Anne-Marie, A. Katus Hugo, Taube Christian, Bewig Burkhard, Beate Polte, Kronsbein Juliane, Stubbe Beate, Bals Robert, Johanna I. Lutter, Sarah Marietta von Siemens, Lange Christoph, Vogelmeier Claus, Ellen Burmann, Wirtz Hubert, Kathrin Kahnert, Erich Traugott, Behr Jürgen, Birte Struck, Vivien Janke, Lenka Krabbe, Timmermann Hartmut, Wagner Ulrich, Anita Reichel, Sabine Michalewski, Gudrun Hübner, Seeger Werner, Doris Lehnert, Jany Berthold, Kropf-Sanchen Cornelia, Sandra Söhler, Jeanette Pieper, Ulrike Rieber, Peter Alter, Herth Felix, Zabel Peter, Andreas Stefan, Koczulla Rembert, Held Matthias, Tobias Welte, Franziska C. Trudzinski, Patricia Berger, Kahnert Kathrin, Jana Graf, Jürgen Behr, Rosalie Untsch, Rudolf A. Jörres, Kornelia Speth, Britta Markworth, Ewert Ralf, Gertraud Weiß, Hans-Ulrich Kauczor, Claus Vogelmeier, Katrin Schwedler, Katrin Wons, Bertram J. Jobst, Barbara Arikan, Margret Gleiniger, Henrik Watz, Watz Henrik, Studnicka Michael, Beate Schaufler, Diana Schottel, Sonja Rohweder, Robert Bals, Ilona Kietzmann, Virchow J. Christian, Burkhard Bewig, Hauck Rainer, and Michaela Schrade-Illmann
- Subjects
Pulmonary and Respiratory Medicine ,Percentile ,medicine.medical_specialty ,Medizin ,Diagnostic Techniques, Respiratory System ,Single item ,CAT score ,03 medical and health sciences ,Pulmonary Disease, Chronic Obstructive ,0302 clinical medicine ,Internal medicine ,medicine ,COPD ,In patient ,030212 general & internal medicine ,Lung function ,Emphysema ,business.industry ,Regression analysis ,Cat Score ,Copd ,medicine.disease ,Exploratory factor analysis ,respiratory tract diseases ,030228 respiratory system ,Cohort ,business - Abstract
The COPD Assessment Test (CAT) is in widespread use for the evaluation of patients with chronic obstructive pulmonary disease (COPD). We assessed whether the CAT items carry additional information beyond the sum score regarding COPD characteristics including emphysema. Patients of GOLD grades 1 to 4 from the COPD cohort COSYCONET (German COPD and Systemic Consequences - Comorbidities Network) with complete CAT data were included (n = 2270), of whom 493 had chest CT evaluated for the presence of emphysema. Comorbidities and lung function were assessed following standardised procedures. Cross-sectional data analysis was based on multiple regression analysis of the single CAT items against a panel of comorbidities, lung function, or CT characteristics (qualitative score, 15th percentile of mean lung density), with age, BMI and gender as covariates. This was supported by exploratory factor analysis. Regarding the relationship to comorbidities and emphysema, there were marked differences between CAT items, especially items 1 and 2 versus 3 to 8. This grouping was basically confirmed by factor analysis. Items 4 and 5, and to a lower degree 1, 2 and 6, appeared to be informative regarding the presence of emphysema, whereas the total score was not or less informative. Regarding comorbidities, similar findings as for the total CAT score were obtained for the modified Medical Research Council scale (mMRC) which was also informative regarding emphysema. Our findings suggest that the usefulness of the CAT can be increased if evaluated on the basis of single items which may be indicating the presence of comorbidities and emphysema.
- Published
- 2020