Table 3: Concordance between a) predicted (ECSC, GLI-2012 and local study equations) and measured FEV1, FVC and FEV1/FVC (%) ratios in healthy individuals and b) predicted by ECSC, GLI-2012 and local study equations FEV1, FVC and FEV1/FVC (%) ratios in COPD individuals.

a)
All subjects
(N=500)
Men
(N=239)
Women
(N=261)
ECSC GLI Local
study
ECSC GLI Local
study
ECSC GLI Local
study
FEV1
Lin’s coefficient ρc 0.917 0.910 0.920 0.838 0.829 0.844 0.886 0.874 0.888
Average difference* -0.067 0.126 0.000 -0.053 0.145 0.000 -0.079 0.108 -0.000
Pearson's coef. r 0.921 0.920 0.923 0.849 0.849 0.854 0.893 0.889 0.893
R2 0.848 0.846 0.852 0.721 0.722 0.730 0.798 0.790 0.798
FVC
Lin’s coefficient ρc 0.887 0.855 0.893 0.759 0.722 0.789 0.809 0.762 0.822
Average difference* -0.055 0.297 -0.027 0.006 0.324 -0.030 -0.110 0.273 -0.025
Pearson's coef. r 0.890 0.893 0.898 0.788 0.792 0.807 0.827 0.831 0.833
R2 0.792 0.798 0.807 0.622 0.628 0.652 0.684 0.691 0.694
FEV1/FVC
Lin’s coefficient ρc 0.097 0.139 0.170 0.089 0.102 0.053 0.077 0.123 0.153
Average difference* -4.919 -3.411 0.000 -4.033 -2.739 -0.000 -5.731 -4.025 0.000
Pearson's coef. r 0.193 0.249 0.305 0.164 0.167 0.166 0.165 0.243 0.288
R2 0.037 0.062 0.093 0.027 0.028 0.027 0.027 0.059 0.083
*Predicted – measured
b)
All subjects
(N=124)
Men
(N = 84)
Women
(N = 40)
ECSC
vs.
Local eqs.
GLI
vs.
Local eqs.
ECSC
vs.
GLI eqs.
ECSC
vs.
Local eqs.
GLI
vs.
Local eqs.
ECSC
vs.
GLI eqs.
ECSC
vs.
Local eqs.
GLI
vs.
Local eqs.
ECSC
vs.
GLI eqs.
FEV1
Lin’s coefficient ρc 0.989 0.987 0.967 0.988 0.976 0.955 0.962 0.983 0.916
Average difference* -0.089 0.083 -0.172 -0.071 0.088 -0.160 -0.127 0.071 -0.197
Pearson's coef. r 0.998 0.995 0.996 0.997 0.990 0.997 >0.999 0.995 0.993
R2 0.996 0.989 0.992 0.994 0.979 0.993 >0.999 0.990 0.987
FVC
Lin’s coefficient ρc 0.988 0.932 0.937 0.979 0.869 0.912 0.965 0.875 0.779
Average difference* -0.011 0.287 -0.298 0.047 0.299 -0.252 -0.134 0.262 -0.396
Pearson's coef. r 0.991 0.987 0.992 0.982 0.972 0.995 0.995 0.983 0.993
R2 0.981 0.974 0.985 0.965 0.944 0.989 0.990 0.967 0.986
FEV1/FVC
Lin’s coefficient ρc 0.093 0.190 0.713 0.107 0.160 0.730 0.012 0.061 0.639
Average difference* -6.317 -4.466 -1.852 -5.707 -4.050 -1.657 -7.599 -5.340 -2.259
Pearson's coef. r 0.499 0.666 0.953 >0.999 0.969 0.969 0.092 0.309 0.960
R2 0.249 0.443 0.909 >0.999 0.939 0.938 0.008 0.096 0.922
*Differences calculated as ECSC-Local Eqs., GLI-Local Eqs. and ECSC-GLI, respectively

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