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This plot of the difference between the methods against their mean illustrates the relationship between the measurement error and the true value. Total lung capacity measured by plethysmography is 1.12 L greater than total lung capacity measured by HRCT. Greater variation from the mean is seen at higher lung volumes, suggesting measurement error is greater at higher lung volumes.
Abbreviations: HRCT, high-resolution computed tomography; pleth, plethysmography.
