Figure 4From: Nordic Walking improves daily physical activities in COPD: a randomised controlled trialSix-minute walking distance of COPD patients of intervention and control group over time. Statistical comparisons within groups: * p < 0.01 compared to baseline; †p < 0.05 compared to baseline; statistical comparison between groups (intervention vs. control): ‡ p < 0.01 at all times. (Whiskers represent SD).Back to article page