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Table 3 Correlations of airway lumen area at inspiratory CT in the supine and standing positions with the results of the pulmonary function test

From: Differences in airway lumen area between supine and upright computed tomography in patients with chronic obstructive pulmonary disease

Generation Supine Standing Generation Supine Standing
FEV1    RV   
 Trachea 0.22 0.24  Trachea 0.10 0.06
 Main bronchus 0.25 0.32**  Main bronchus – 0.04 – 0.08
 3rd 0.43** 0.50**  3rd – 0.18 – 0.08
 4th 0.38** 0.50**  4th – 0.11 – 0.07
 5th 0.38** 0.43**  5th – 0.12 – 0.06
 6th 0.32* 0.40**  6th – 0.05 – 0.09
%FEV1    %RV   
 Trachea 0.05 0.23  Trachea – 0.13 – 0.16
 Main bronchus 0.21 0.39**  Main bronchus – 0.25 – 0.21
 3rd 0.44** 0.45**  3rd – 0.39* – 0.33*
 4th 0.41** 0.41**  4th – 0.26 – 0.22
 5th 0.34* 0.38**  5th – 0.21 – 0.16
 6th 0.21 0.29*  6th – 0.12 – 0.13
    IC/TLC   
     Trachea 0.07 0.11
     Main bronchus 0.17 0.07
     3rd 0.26 0.20
     4th 0.12 0.08
     5th – 0.01 – 0.06
     6th – 0.05 – 0.03
  1. *and ** indicate p < 0.05 and p < 0.01, respectively. FEV1, forced expiratory volume in 1 s; %FEV1, forced expiratory volume in 1 s as a percentage of predicted forced expiratory volume in 1 s; RV, residual volume; %RV, residual volume as a percentage of predicted residual volume; IC/TLC; inspiratory capacity/total lung capacity ratio