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Pearson correlations of the FVC Z-score with the TLC for participants with a Global Lung Initiative-defined normal FEV1/FVC ≥ lower limit of normal (n = 1,914). Using Global Lung Initiative equations and the lower limit of normal at a Z-score of −1.64, a normal FEV1/FVC was defined by a Z-score ≥ −1.64. TLC, total lung capacity.
