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. 2013 Dec 10;8:641–652. doi: 10.2147/COPD.S51245

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© 2013 Solem et al. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License

The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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Data elements collected within the study.

Abbreviations: ATS, American Thoracic Society; BTS, British Thoracic Society; COPD, chronic obstructive pulmonary disease; CTS, Canadian Thoracic Society; ERS, European Respiratory Society; FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity; GOLD, Global Initiative for Chronic Obstructive Lung Disease; HRQoL, health-related quality of life; SGRQ-C, St George’s Respiratory Questionnaire for COPD; WPAI-SHP, Work Productivity and Activity Impairment Questionnaire – Specific Health Problem.