Fig. 5From: Effect of oral glycine on the clinical, spirometric and inflammatory status in subjects with cystic fibrosis: a pilot randomized trialCorrelation between forced expiratory volume at first second (FEV1) and peripheral oxygen saturation (SpO2) in subjects with cystic fibrosis. The scatter plots correspond either to all measures obtained at all visits (empty circles) or to the mean of the six visits for each patient (filled circles). The hyperbolic function formula and its associated coefficient of determination (r2) are shown in each panelBack to article page