Skip to main content

Table 2 Pearson’s r correlations and determination coefficients (R2) between continuous CT metrics of emphysema (%LAA-950insp and %pLDA) or airway disease (% fLDA and AWTPi10) and functional parameters

From: Validation of a method to assess emphysema severity by spirometry in the COPDGene study

 ESIFEV1FEV1/FVC
rR2prR2prR2p
%LAA-950inspa0.800.64<.001−0.600.36<.001−0.750.56<.001
%pLDAb0.820.67<.001−0.630.40<.001−0.740.55<.001
%fLDAb0.590.35<.001−0.580.34<.001−0.710.50<.001
AWTPi10a0.170.03<.001−0.340.12<.001−0.160.03<.001
  1. Legend: AWTPi10 = Average wall thickness of bronchi with an internal perimeter of 10 mm, %fLDA = percentage of functional low density area, %LAA-950insp = percentage of lung attenuation area with values <−950 Hounsfield Units at inspiratory CT scan, %pLDA = percentage of persistent low density area, a parameters calculated by using Apollo (VIDA), b parameters calculated by using Imbio