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Criteria of obstruction that establish a diagnosis of COPD have been debated in recent years. We carried out a follow-up study to assess the impact of the new LLN reference equation for Chinese on detecting COPD compared with the traditional 0.7fixed criteria.We examined the prevalence and characteristics of airflow limitation for a non-child population using post-bronchodilator airflow with both...
Little is known on the long-term validity of reference equations used in the calculation of FEV 1 and FEV 1 /FVC predicted values.This survey assessed the prevalence of chronic airflow obstruction in a population-based sample and how it is influenced by: (i) the definition of airflow obstruction; and (ii) equations used to calculate predicted values. Subjects aged 45 or more were recruited...
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