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Table 1 Correlation between the pulmonary function tests and extent of emphysema (%LA) below − 950 HU

From: Correlation between quantitative multi-detector computed tomography lung analysis and pulmonary function tests in chronic obstructive pulmonary disease patients

   FEV1 FVC FEV1/FVC
Multi-detector CT parameters Extent of emphysema (− 950 HU
Right lung LD index% r value − 0.317* − 0.161 − 0.420**
p value 0.025 0.264 0.002
Right upper lung LD index% r value − 0.434** − 0.284* − 0.563**
p value 0.002 0.045 < 0.001
Right lower lung LD index% r value − 0.344* − 0.186 − 0.478**
p value 0.015 0.197 < 0.001
Left lung LD index% r value − 0.313* − 0.272 − 0.413**
p value 0.027 0.056 0.003
Left upper lung LD index% r value − 0.493** − .324* − .620**
p value < 0.001 0.022 < 0.001
Left lower lung LD index% r value − 0.448** − .260 0.295*
p value 0.001 .068 0.037
Both lung LD index% r value − 0.313* − 0.272 − 0.413**
p value 0.027 0.056 0.003
Both upper lung LD index% r value − 0.460** − .300* − .591**
p value 0.001 0.034 < 0.001
Both lower lung LD index% r value − 0.397** − 0.219 − .543**
p value 0.004 0.126 < 0.001
  1. Data given are r2 value
  2. *p value < 0.05
  3. **p value < 0.001
  4. Correlation is significant at the 0.05 level (2-tailed)*
  5. Correlation is significant at the 0.01 level (2-tailed) **