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. 2016 Jan 4;9:7. doi: 10.1186/s13104-015-1810-8

Fig. 1.

Fig. 1

Comparisons of VC and FEV1 values between COPD patients aged <75 and ≥75 years with different grades of COPD. a VC, b %VC, c FEV1, d %FEV1. Gray columns <75 years old, Black columns ≥75 years old. Data are presented as mean ± standard deviation (SD). *p < 0.05