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Correlation between Vgrade and TPLF% and GOLD stages.
Note: Pearson correlation coefficients and linear regression lines with best-fit values (continuous line) and 95% confidence intervals (dotted lines) are presented.
Abbreviations: GOLD, Global Initiative for Chronic Obstructive Lung Disease; TPLF%, total preserved lung function; SPECT, single-photon emission computed tomography; Vgrade, penetration grade of Technegas in V SPECT.
