Physical Activity Characteristics across GOLD Quadrants Depend on the Questionnaire Used

• Heleen Demeyer,

  Affiliations KU Leuven, Department of Rehabilitation Sciences, B-3000, Leuven, Belgium, University Hospitals Leuven, Department of Respiratory Diseases, B-3000, Leuven, Belgium

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• Elena Gimeno-Santos,

  Affiliations Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain, CIBER Epidemiologia y Salud Publica (CIBERESP), Barcelona, Spain, Universitat Pompeu Fabra (UPF), Barcelona, Spain

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• Roberto A. Rabinovich,

  Affiliation ELEGI/Colt laboratory, UoE/MRC Centre for Inflammation Research, The University of Edinburgh, Edinburgh, Scotland

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• Miek Hornikx,

  Affiliations KU Leuven, Department of Rehabilitation Sciences, B-3000, Leuven, Belgium, University Hospitals Leuven, Department of Respiratory Diseases, B-3000, Leuven, Belgium

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• Zafeiris Louvaris,

  Affiliation Dept of Critical Care Medicine, Pulmonary Rehabilitation Centre, Evangelismos Hospital, M. Simou and G.P. Livanos Laboratories, National and Kapodistrian University of Athens, Thorax Foundation, Athens, Greece

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• Willem I. de Boer,

  Affiliation Department of Pulmonology, Leiden University Medical Center, Leiden, Netherlands

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• Niklas Karlsson,

  Affiliation Astra Zeneca, Mölndal, Sweden

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• Corina de Jong,

  Affiliation Department of General Practice, University Medical Center Groningen, Groningen, Netherlands

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• Thys Van der Molen,

  Affiliation Department of Primary Care, University of Groningen, University Medical Centre Groningen, Groningen, Netherlands

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• Ioannis Vogiatzis,

  Affiliation Dept of Critical Care Medicine, Pulmonary Rehabilitation Centre, Evangelismos Hospital, M. Simou and G.P. Livanos Laboratories, National and Kapodistrian University of Athens, Thorax Foundation, Athens, Greece

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• Wim Janssens,

  Affiliation University Hospitals Leuven, Department of Respiratory Diseases, B-3000, Leuven, Belgium

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• Judith Garcia-Aymerich,

  Affiliations Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain, CIBER Epidemiologia y Salud Publica (CIBERESP), Barcelona, Spain, Universitat Pompeu Fabra (UPF), Barcelona, Spain

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• Thierry Troosters ,

  * E-mail: thierry.troosters@med.kuleuven.be

  Affiliations KU Leuven, Department of Rehabilitation Sciences, B-3000, Leuven, Belgium, University Hospitals Leuven, Department of Respiratory Diseases, B-3000, Leuven, Belgium

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• Michael I. Polkey,

  Affiliation NIHR Respiratory Biomedical Research Unit of the Royal Brompton and Harefield NHS foundation Trust and Imperial College London, London, United Kingdom

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• PROactive consortium

  ¶Membership of the PROactive consortium is listed in the Acknowledgments.

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