Inconsistencies in the COPD diagnosis (post bronchodilator spirometry) and some of the predisposing factors.

Percentages on the left part of columns are from the total studied population, whereas those on the right are strata (overlapping) from the above categories. 95%CI = 95% confidence interval; Inconsistent = different result between the two examinations. New GOLD = fulfilling FEV1/FVC<0.70 only during the second exam (similar for the other airflow obstruction criteria). Reversed GOLD = met GOLD criterion during the first examination, but not during the second examination; LLN = lower limit of normal
Same participants in two surveys 5–9 years apart.