Understanding the contribution of native tracheobronchial structure to lung function: CT assessment of airway morphology in never smokers

Table 6 Multivariate regression analysis for FEV ₁ and FEF 25–75 with the projected branching generation number

	FEV ₁			FEF 25–75
	Parameter (Std Error)	Standardized Parameter	P Value	Parameter (Std Error)	Standardized Parameter	P Value
Projected BGN	163 (48)	0.18	0.001	354 (114)	0.26	0.002
Segmental airway lumen volume, mm³	0.76 (0.50)	0.09	0.13	3.2 (1.2)	0.25	0.007
Age, yr	−31 (4)	−0.40	<0.0001	−45 (9)	−0.39	<0.0001
Female sex	−640 (104)	−0.42	<0.0001	−814 (243)	−0.35	0.001
Caucasian race	432 (134)	0.16	0.002	−254 (315)	−0.06	0.42
Height, cm	25 (5)	0.32	<0.0001	−9.7 (12.4)	−0.08	0.44

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