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. 2022 Mar 17;17:579–590. doi: 10.2147/COPD.S326037

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© 2022 Lee et al.

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Correlation between serum 25-OH vitamin D level and lung function parameters in terms of (A) airflow limitation (FEV₁, % pred), (B) diffusing capacity (DLco, % pred), and (C) hyperinflation (RV/TLC, %).

Abbreviations: FEV₁, forced expiratory volume in 1 second; pred, predicted; DLco, diffusing capacity of the lung for carbon monoxide; RV, residual volume; TLC, total lung capacity.