Fig. 2From: Importance of the relationship between symptoms and self-reported physical activity level in stable COPD based on the results from the SPACE studyThe distribution of physical activity level through GOLD classes by 2013 and 2017 editions. a GOLD 2013 by mMRC. b GOLD 2013 by CAT. c GOLD 2017 by mMRC. d GOLD 2017 by CATBack to article page