Table E6.

Factor analysis of QCT variables with combined cohort of both asthmatic patients and patients with COPD

	Factors
1	2	3
Mean LA/BSA (mm2/m2)	0.99	0.02	−0.05
Mean TA/BSA (mm2/m2)	0.94	0.02	0.00
Mean WA/BSA (mm2/m2)	0.98	0.02	−0.02
Mean %WA	−0.78	0.03	0.16
Insp VI−950	−0.06	0.73	0.60
MLDE/I	−0.04	0.33	0.87
Mean voxel index change	−0.18	−0.04	0.87
Mean fractal 856	0.15	0.57	0.38
Insp VI−950	−0.08	0.92	0.08
Perc15 (HU)	0.06	−0.94	0.13
Mean fractal 950	0.07	0.75	0.18

The 3 factors accounted for 81% of variation of all variables.

Insp VI−950, Inspiratory voxel index less than −950 HU.