Table 5b.

Multiple regression analysis for % Expiratory LAA_E-856: Tracheal Air Correction

Source	bSD*	95% CI†	P
Mean Tracheal Air Attenuation	−1.76	−3.75, 0.22	0.08
FRC CT	2.00	0.57, 3.42	0.007 *
Age	2.45	1.02, 3.89	0.001 *
Sex ‡	0.89	−1.85, 3.63	0.52
BMI	0.18	−1.21, 1.58	0.80
Scanner model	NA	NA	<0.001 *

The arc sine transformations of the actual percentages for % Expiratory LAA_E-856 were analyzed (30).

Residual plots demonstrated that the regression model using the transformed values was appropriate.

^*First-order coefficient that represents the change per SD change in predictor variable.

^†95% confidence interval.

^‡Females compared to males.