Skip to main content
Figure 2 | BMC Pulmonary Medicine

Figure 2

From: Random variation of inspiratory lung function parameters in patients with COPD: a diagnostic accuracy study

Figure 2

Panel A: Bland-Altman plot showing the absolute difference of Inspiratory Capacity (IC) versus the average; it shows a heteroscedastic scatter of the IC. Panel B: Absolute difference of IC versus average IC plus linear regression; this panel shows a slope in the regression line. Panel C: Difference IC now presented as the percentage of the average value; this panel shows a homoscedastic scatter. Panel D: Percentage difference of IC versus average IC plus linear regression; this panel shows a flat slope of the regression line, not significantly different from zero. The dashed lines in panel B and D represent the confidence interval of the regression line.

Back to article page

BMC Pulmonary Medicine

ISSN: 1471-2466

Contact us