Statistical analysis
COPD
COPD
To assess the difference between detecting COPD in the study groups, with a power of 95%, an alpha risk of 2.5%, and considering the cluster randomisation of the medical practices (with a coefficient intra-cluster of 0.01),Quantitative variables were given as a median with interquartile range (IQR) and compared using Mann–Whitney tests. Qualitative variables were given as numbers with percentages, and compared using χ