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The best criterion for diagnosing airway obstruction in COPD, fixed ratio (FR: FEV1/FVC&lt;0.7) or lower limit of normality (LLN), remains controversial. We compared the long-term evolution of COPD patients according to the initial obstruction criteria.

<p>Fixed Ratio versus Lower Limit of Normality for Diagnosing COPD in Primary Care: Long-Term Follow-Up of EGARPOC Study</p>