Figure 3From: Physical activity level and its clinical correlates in chronic obstructive pulmonary disease: a cross-sectional studyGraphical presentation of the evolving regression model adjusted for age and gender. The darker color represents the proportion of variance explained (R2) from the previous step, and the light grey represents the R2 change from the variable entered at that step. Numbers outside of the bars are the total R2 at the current step, * = significant improvement from previous step, CRP = C-reactive protein, FFMI = fat-free mass index, FEV1 = Forced expiratory volume in one second in percent of predicted.Back to article page