Table 2.

Measures of Ventilation Heterogeneity

Stepwise Linear Regression R2	HFOV	CV
Y	0.028 ± 0.03	0.294 ± 0.12
Y/Z	0.040 ± 0.02	0.296 ± 0.12
Y/Z/S	0.042 ± 0.02	0.298 ± 0.12
means±SD for R2; n=5 HFOV, n=4 CV. Y, height; S, side (left vs. right); Z, coronal location (apex-base).

Coefficients of Variation	HFOV	CV
Total: COVt	0.41 ± 0.06	0.46 ± 0.12
Other: COVi	0.40 ± 0.06	0.38 ± 0.12
Y only: COVy	0.09 ± 0.03	0.25 ± 0.04*

means±SD; n=5 HFOV, n=4 CV. Y, dorsal-ventral (vertical) height

^*p<0.01 HFOV vs. CV