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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Invest Radiol. 2012 Oct;47(10):596–602. doi: 10.1097/RLI.0b013e318262292e

Table 4b.

Multiple regression analysis for % Inspiratory LAAI-950: Tracheal Air Correction

Source bSD* 95% CI† P
Mean Tracheal Air Attenuation −1.75 −2.87, −0.62 0.003 *
TLC CT 1.83 0.68, 2.97 0.002 *
Age 0.05 −0.78, 0.89 0.90
Sex ‡ −0.76 −3.12, 1.61 0.53
BMI 0.42 −0.32, 1.15 0.26
Scanner model NA NA 0.18

The arc sine transformations of the actual percentages for % Inspiratory LAAI-950 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.

For a 1 SD increase in mean tracheal air attenuation, % inspiratory LAAI-950 decreases 1.75; this change differs from zero (P=0.003). For a 1 SD increase in TLCCT, % inspiratory LAAI-950 increases 1.83; this change differs from zero (P=0.002).