1. Volume 108, Issue 1, Pages 86-94 (January 2014)
Physical activity and longitudinal change in 6-min walk distance in COPD patients 
Bente Frisk, Birgitte Espehaug, Jon A. Hardie, Liv I. Strand, Rolf Moe-Nilssen, Tomas M.L. Eagan, Per S. Bakke, Einar Thorsen 
Respiratory Medicine 
Volume 108, Issue 1, Pages (January 2014)
DOI: /j.rmed
Copyright © 2013 Elsevier Ltd Terms and Conditions

2. Figure 1
The study population during 3 years of follow-up. COPD: chronic obstructive pulmonary disease, 6MWT: six-min walk test.
Respiratory Medicine  , 86-94DOI: ( /j.rmed )
Copyright © 2013 Elsevier Ltd Terms and Conditions

3. Figure 2
The distribution of the change in the six-min walk distance (6MWD), 3 years minus baseline.
Respiratory Medicine  , 86-94DOI: ( /j.rmed )
Copyright © 2013 Elsevier Ltd Terms and Conditions

4. Figure 3
Mean six-min walk distance (6MWD) by GOLD-stages estimated with unadjusted generalized estimating equations (GEE) regression analyses during 3 years of follow-up.
Respiratory Medicine  , 86-94DOI: ( /j.rmed )
Copyright © 2013 Elsevier Ltd Terms and Conditions