TABLE 3

Aetiology of bronchiectasis in the four clusters

Cluster 1:
Pseudomonas
Cluster 2:
“Other chronic infection”
Cluster 3:
“Daily sputum”
Cluster 4:
“Dry bronchiectasis”
Overall p-value
Patients179 (100)273 (100)373 (100)307 (100)
Idiopathic46 (26)86 (33)131 (36)110 (36)0.09
Post-infective63 (36)54 (21)96 (26)77 (25)0.004
COPD21 (12)29 (11)50 (14)20 (6.6)0.03
Connective tissue disease10 (5.6)26 (9.8)26 (7.1)27 (8.9)0.377
Immunodeficiency11 (6.2)17 (6.4)14 (3.8)14 (4.6)0.436
ABPA10 (5.6)20 (7.6)12 (3.3)12 (3.9)0.083
Asthma2 (1.1)10 (3.8)8 (2.2)15 (4.9)0.071
Inflammatory bowel disease3 (1.7)6 (2.3)12 (3.3)3 (1)0.233
Ciliary dysfunction7 (4)6 (2.3)5 (1.4)2 (0.7)0.055
Aspiration2 (1.1)6 (1.9)3 (0.8)3 (1)0.419
α1-antitrypsin deficiency0 (0)1 (0.4)3 (0.8)6 (2)0.091
Congenital0 (0)2 (0.8)3 (0.8)0 (0)0.284
Other2 (1.1)1 (0.4)2 (0.5)15 (4.9)<0.001
  • Data are presented as n (%), unless otherwise stated. COPD: chronic obstructive pulmonary disease; ABPA; allergic bronchopulmonary aspergillosis.