Table 4.

—Multivariate Regression Analysis for WA% in Six Bronchial Paths

	Lobar Emphysema
	Segmental Airway		Subsegmental Airway
Bronchial Path	Regression Coefficient	P Value	Regression Coefficient	P Value
RB1	−0.02	.13	0.03	< .0001
RB4	−0.02	.03	0.02	.054
RB10	0.001	.92	0.02	.02
LB1	0.02	.12	0.04	< .0001
LB4	0.009	.43	0.04	< .0001
LB10	0.01	.28	0.04	< .0001

In these analyses, the sample size was 950; 33 subjects were excluded because their measurements of lobar lung volume were not available. In these models, the main predictor was lobar emphysema as measured by CT scan. Adjustment for sex (female = 1), age, height, pack-y smoking, CT scanner brand/make, and lobar volume was performed. See Table 2 legend for expansion of abbreviations.