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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.
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Respiratory Research

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