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Table 2 Correlations between quantitative CT measures in COPDGene subjects

From: Paired inspiratory-expiratory chest CT scans to assess for small airways disease in COPD

  Correlations
  N Mean(SD) %emph Insp -950 Exp -856 E/I mean lung atten. RVC 856–950 Residuals SWRA Pi10
%emphysema Insp -950 8517 6.2 (9.7) --      
%Exp -856 8517 21.9 (19.9) 0.83† --     
E/I mean lung attenuation 8517 0.87 (0.07) 0.51† 0.80† --    
RVC 856–950 8517 −0.37 (0.18) 0.37† 0.48† 0.58† --   
Residuals 8517 0 (11.2) 0 0.56† 0.67† 0.32† --  
SRWA Pi10 (mm) 2867 3.75 (0.12) 0.06* 0.13† 0.23† 0.46† 0.15† --
  1. Pearson correlation coefficients are shown.
  2. *p < 0.01.
  3. †p < 0.0001.