Figure 3. Scatterplots showing the relationship between FEV₁ (%predicted) and the total energy expenditure as assessed by accelerometry, TEE_ACC (black squares) (r = 0.32, 95% 0.09 to 0.52, p = 0.011) and by the Zutphen Physical Activity Questionnaire, TEE_ZPAQ (white dots) (r = 0.31, 95% CI 0.81 to 0.51, p = 0.012), respectively.

Patients with COPD seem to underestimate their daily PA level.