Covariates according to COPD diagnosis at any time.
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Abbreviations: COPD, chronic obstructive pulmonary disease; FEV1% predicted, forced expiratory volume in one second in % of predicted.
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2015-12-02

Abbreviations: COPD, chronic obstructive pulmonary disease; FEV1% predicted, forced expiratory volume in one second in % of predicted.