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. 2017 May 26;12:1579–1587. doi: 10.2147/COPD.S131847

Figure 4.

Figure 4

Vgrade 1, 2, and 3 in relation to the technically accepted and reproducible lung function test results (n=75).

Note: The plots of measurements with the mean and the 95% confidence intervals are shown.

Abbreviations: FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; SPECT, single-photon emission computed tomography; Vgrade, penetration grade of Technegas in V SPECT.