Prevalences of airflow obstruction, frequency of inconsistent longitudinal diagnosis and hazard ratio depending on the definition.

COPD 1 and COPD 2 = sample prevalence (as percentage) of COPD in the first and second evaluation in the 2026 subjects with two spirometries; GOLD 2–4 = FEV1/FVC<0.7 & FEV1<80% predicted; LLN = lower limit of normal, the 5th percentile adjusted for gender, age and height. Hazard ratio = the risk of death (n = 2348) from a Cox model adjusting by age and gender based on the presence of airflow obstruction depending on the definition used. Inconsistency is the percentage of participants with a change in diagnosis of airflow obstruction (either a new diagnosis in the second evaluation or the presence of airflow obstruction in the first evaluation but not in the second). Exacerbations = odds ratio of having 2 or more exacerbations in the previous year assessed at the second evaluation in a model adjusted by age and gender. 95%CI = 95% confidence interval.
Prevalences of airflow obstruction, frequency of inconsistent longitudinal diagnosis and hazard ratio depending on the definition.