Table 7. Simple and Multiple Regression Analyses for Lung Attenuation and Airway Parameters.

LAAI-950	Simple Linear		Multiple Regression (Adjusted R2 = 0.082, p = 0.010)
	r	P	β	95% CI	P
TLCCT	0.170	0.017	0.001	0.000–0.001	0.024
Age	0.135	0.046	0.041	0.007–0.075	0.018
Smoking*	−0.014	0.432	−1.350	−2.809–0.109	0.070
Sex†	−0.111	0.082	−0.692	−2.194–0.810	0.364

^*Ever smokers compared with never smokers, ^†Women compared with men. CI = confidence interval, FRC_CT = functional residual capacity, LAA_E-856 = percentage of low attenuation area with CT attenuation values less than −856 HU at expiration, LAA_I-950 = percentage of low attenuation area with CT attenuation values less than −950 HU at inspiration, Pi10 = inner perimeter of 10 mm, TLC_CT = total lung capacity