Table 1

NCFBE Etiology	Prevalence	% of pts with at least 1 hospitalization during 2013	p- value
Idiopathic	38%	13%	0.56
Post-infective	28%	20%	0.52
COPD	17%	38%	0.04
Immunodeficiency	4%	17%	0.57
Connective tissue disease	3%	0%	0.34
IBD	2%	0%	0.59
Severe asthma	2%	20%	0.67
Others	6%	27%	0.5