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Correlation between CAT score and MMSE scores (A), BDI scores (B), post-bronchodilator FEV1 (% predicted) (C), and post-bronchodilator FEV1/FVC (D).
Abbreviations: BDI, Beck Depression Inventory; CAT, COPD assessment test; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; MMSE, Mini-Mental State Examination.
