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Table 3 Correlations between gas trapping measures and quantitative outcomes in all subjects

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

  Correlations
  N Mean (SD) Exp−856 E/I MLA RVC856-950 Residual
FEV1 % predicted 8463 76.6 (25.5) −0.69* −0.60* −0.54* −0.33*
FVC % predicted 8463 87.2 (18.2) −0.33* −0.32* −0.44* −0.18*
FEV1/FVC 8463 0.67 (0.16) −0.82* −0.67* −0.41* −0.37*
FEF25-75 8463 1.75 (1.25) −0.60* −0.59* −0.38* −0.36*
FRC/TLC ratio 8517 0.58 (0.13) 0.65* 0.89* 0.76* 0.65*
6MWD 8407 1363 (397) −0.32* −0.34* −0.46* −0.18*
Exacerbation frequency 8517 0.4 (0.9) 0.26* 0.22* 0.19* 0.12*
SGRQ total 8517 27.0 (22.8) 0.39* 0.36* 0.43* 0.20*
MMRC dyspnea 8506 1.3 (1.4) 0.36* 0.32* 0.42* 0.15*
  1. Pearson correlation coefficients are shown.
  2. *p < 0.0001.