Table 1. Etiological factors.

	n	%
Recurrent pulmonary infections	946	69.7
Tuberculosis	162	11.9
Viral infections in childhood	101	7.4
Foreign body	23	1.7
Infectious hydatid cyst	10	0.7
Kartagener syndrome	4	0.3
Traumatic bronchus stenosis	3	0.2
Unknown	108	8.0
Total	1,357	100