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Figure 5 | BMC Pulmonary Medicine

Figure 5

From: Relationship between CT air trapping criteria and lung function in small airway impairment quantification

Figure 5

Receiver-operating characteristic (ROC) curves show the diagnostic performance of (E-I)/I using dN2 as a functional test of airway obstruction (dN2 cut-off = 2.5% N2/l). The best threshold is reported, alongside the sensitivity and specificity: (E-I)/I MLD = −0.11 (0.70; 0.73) – (E-I)/I -850–1024 = −0.68 (0.63; 0.67) – (E-I)/I -850–910 = −0.70 (0.79; 0.61).

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