American journal of respiratory and critical care medicine
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Am. J. Respir. Crit. Care Med. · Dec 2024
Comparative StudySeverity of Airflow Obstruction Based on FEV1/FVC vs FEV1% of Predicted in the General US Population.
Rationale: According to the Global Initiative for Obstructive Lung Disease (GOLD), the FEV1/FVC ratio is used to confirm the presence of airflow obstruction in the diagnosis of chronic obstructive pulmonary disease (COPD), whereas FEV1 percent predicted normal value (FEV1%pred) is used for grading its severity. The STaging of Airflow obstruction by the FEV1/FVC Ratio (STAR), and its prediction of adverse outcomes, has not been evaluated in general populations. Objectives: To compare the STAR (FEV1/FVC) and the GOLD (FEV1%pred) classifications for the severity of airflow limitation in terms of exertional breathlessness and mortality in the general U. ⋯ Conclusions: FEV1/FVC and FEV1%pred as measures of airflow limitation severity show similar predictions of breathlessness and mortality in the adult U. S. population across ethnicity groups. However, Stage 1 differed more clearly from nonobstruction on the basis of FEV1/FVC ratio than FEV1%pred.