Table 2.

Demographic characteristics of study population (N = 88)

Age (mean ± SD)	63.6 ± 10.5
Sex (female/male)	12/76
Disease duration, median (25th to 75th percentile)	5 (2-10) years
Smoking history, median (25th to 75th percentile)	40 (20-60) pack/year
Number of exacerbations, median (25th to 75th percentile)	0 (0-1)/last year
Number of hospitalizations, median (25th to 75th percentile)	0 (0-1)/last year
Comorbid diseases (present/absent)	47/41
Oxygen therapy (present/absent)	8/80
Maintenance therapy with inhaled steroid (present/absent)	49/39