Table 2.

QCT Measures of BA Ratio and Airway Morphology by Airway Type

QCT Measurement	Control Subjects		Bronchiectasis Subjects				Comparison
	Airway Type
	Control Patients		Nonbronchiectatic		Bronchiectatic		Bronchiectatic vs Nonbronchiectatic	Bronchiectatic vs Control Patients
	Mean	± SD	Mean	± SD	Mean	± SD	P	P
BA ratio
Whole-lung	0.71	± 0.10	0.67	± 0.20	1.07	± 0.28	.0001	<.0001
Generation
4	0.75	± 0.10	0.77	± 0.25	1.07	± 0.26	.003	<.0001
5	0.71	± 0.12	0.63	± 0.20	0.95	± 0.28	.001	.0002
6	0.66	± 0.14	0.61	± 0.21	1.20	± 0.49	<.0001	.0001
PWA
Whole-lung	−434	± 68	−524	± 103	−462	± 132	.14	.31
Generation
4	−347	± 91	−458	± 115	−412	± 129	.36	.10
5	−417	± 86	−517	± 174	−441	± 143	.051	.30
6	−539	± 87	−612	± 129	−536	± 157	.15	.95
WT
Whole-lung	1.23	± 0.05	1.22	± 0.08	1.30	± 0.08	.02	.006
Generation
4	1.24	± 0.06	1.21	± 0.09	1.30	± 0.10	.003	.02
5	1.23	± 0.06	1.22	± 0.10	1.31	± 0.11	.02	.02
6	1.22	± 0.05	1.22	± 0.09	1.28	± 0.10	.08	.054
WA
Whole-lung	25.1	± 8.8	18.1	± 3.9	22.9	± 9.3	.42	.16
Generation
4	27.0	± 4.8	21.2	± 4.8	24.1	± 10.5	.31	.14
5	22.7	± 3.6	17.4	± 4.1	22.6	± 8.4	.33	.41
6	20.3	± 4.8	14.7	± 3.9	23.7	± 16.1	.49	.45
WA%
Whole-lung	54	± 4	59	± 7	60	± 6	.15	.001
Generation
4	50	± 7	55	± 9	58	± 6	.12	.0003
5	54	± 5	58	± 10	61	± 7	.18	.002
6	58	± 5	64	± 12	62	± 8	.48	.10
Airway lumen diameter
Whole-lung	3.59	± 0.70	2.93	± 0.82	3.37	± 0.88	.09	.31
Generation
4	4.69	± 0.86	4.00	± 1.00	4.05	± 1.06	.55	.02
5	3.46	± 0.82	2.81	± 0.82	3.20	± 1.04	.15	.30
6	2.61	± 0.70	1.99	± 0.89	2.91	± 0.99	.003	.54

BA ratio = ratio of the diameters of bronchial lumen and adjacent artery; PWA = peak wall attenuation; QCT = quantitative CT; WA = wall area; WA% = wall area percent; WT = wall thickness.