Demographics of the COPD subjects for microarray analysis.

Exacerbations were defined over a 3 year follow up; frequent denotes 2 or more exacerbations each year, zero denotes no exacerbations in any year, and intermediate denotes patients who did not fit the frequent or zero exacerbation phenotype. Blood counts are mean values (X109 cells/L).Demographics of the COPD subjects for microarray analysis.