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Validation of the Yale Physical Activity Survey in Chronic Obstructive Pulmonary Disease Patients
Donaire-Gonzalez, David Gimeno-Santos, Elena Serra, Ignasi Roca, Josep Balcells, Eva Rodríguez, Esther Farrero, Eva Antó, Josep M. Garcia-Aymerich, Judith
Donaire-Gonzalez, David
Gimeno-Santos, Elena
Serra, Ignasi
Roca, Josep
Balcells, Eva
Rodríguez, Esther
Farrero, Eva
Antó, Josep M.
Garcia-Aymerich, Judith
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Abstract
Background
Patients with chronic obstructive pulmonary disease (COPD) perform limited physical activity. Surprisingly, there is a lack of research in COPD about the validity of physical activity questionnaires. Our aim was to validate the Yale Physical Activity Survey in COPD patients in order to quantify and classify their levels of physical activity.
Methods
172 COPD patients from 8 university hospitals in Spain wore an accelerometer (SenseWear®Pro2Armband) for 8 days and answered the questionnaire 15 days later. Statistical analyses used to compare both tools measures included: (i) Spearman's correlation coefficient, (ii) intraclass correlation coefficient (ICC) and Bland-Altman plots, (iii) distribution of accelerometer measurements according to tertiles of the questionnaire, and (iv) receiver operating characteristic (ROC) curves to detect sedentary patients.
Results
94% of participants were men, 28% were active smokers and 7% were currently working. Mean (standard deviation) age was 70 (8) years, mean post-bronchodilator FEV1 was 52 (15)% predicted, and median (p25-p75) steps taken was 5,702 (3,273-9,253) steps per day−1. Spearman correlations were low to moderate (from 0.29 to 0.52, all P < .001). ICCs showed weak agreement (from 0.34 to 0.40, all P < .001). A wide variability in agreement was observed in the Bland-Altman plots. Significant differences in accelerometer measurements were found according to questionnaire tertiles (all P < .001). The area under the ROC for identifying sedentarism was 0.71 (95% CI: 0.63-0.79).
Conclusions
The Yale Physical Activity Survey may be a valid tool to classify, but not to quantify, physical activity performed by COPD patients. The summary index of this questionnaire, based on seven short questions, shows the best validity properties. This suggests that it should be considered a screening tool to identify patients at risk for sedentarism.
Keywords
chronic obstructive pulmonary disease (COPD), validation studies, epidemiology, motor activity, questionnaires
Date
2011
Type
Journal article
Journal
Archivos de Bronconeumología
Book
Volume
47
Issue
11
Page Range
552-560
Article Number
ACU Department
Mary MacKillop Institute for Health Research
Faculty of Health Sciences
Faculty of Health Sciences
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DOI
Source URL
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Open Access Status
License
All rights reserved
File Access
Controlled