Fig. 2From: Stronger correlation of peak oxygen uptake with distance of incremental shuttle walk test than 6-min walk test in patients with COPD: a systematic review and meta-analysisForest plot of meta-analysis. Meta-analysis was performed in A 10 studies assessing the correlation coefficient between peak VO2 and distance of the 6MWT and in B five studies assessing the correlation coefficient between peak VO2 and ISWT distance. 6MWT, 6-min walk test; peak VO2, peak oxygen uptake; ISWT, incremental shuttle walk testBack to article page