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. 2013 Apr 8;14(1):42. doi: 10.1186/1465-9921-14-42

Table 3.

Correlations between gas trapping measures and quantitative outcomes in all subjects

 
 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*

Pearson correlation coefficients are shown.

*p < 0.0001.