Fixed Ratio versus Lower Limit of Normality for Diagnosing COPD in Primary Care: Long-Term Follow-Up of EGARPOC Study.
Montserrat LlordésÁngeles JaénElba ZurdoMontserrat RocaInmaculada VazquezPere Almagronull nullPublished in: International journal of chronic obstructive pulmonary disease (2020)
LLN seems to be less useful for COPD diagnosis in primary care. Discordant (FR+LLN-) patients lost more FEV1/FVC during their evolution and tended to become concordant. LLN predicted COPD hospitalizations and mortality more poorly.