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. 2023 Jun 3;96(7):1039–1048. doi: 10.1007/s00420-023-01988-3

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Fig. 1 — Scatter plot of spirometry parameters by measurement cluster. a Forced vital capacity (FVC) as %-predicted. b Forced expiratory volume in 1 second (FEV₁) as %-predicted. c Tiffeneau-index (FEV₁/FVC) as %-predicted