TABLE 3.

Statistical summary of exposure and age effects on alveolar growth and size

	Exposure	Age	HDMA		Ozone		HDMA + Ozone		Two-way ANOVA
									HDMA(HD) vs. Ozone
			3 months	6 months	3 months	6 months	3 months	6 months	Age (months) in parenthesis HD OZONE
Lobe Volume	NS	P < 0.001	NS	NS	NS	NS	NS	0.026	NS	0.009(6)
Number Alveoli	0.020	P < 0.001	NS	NS	0.041	NS	0.006	NS	NS	P < 0.001(3)
Number-weighted alveolar volume	P < 0.001	NS	NS	NS	0.026	NS	0.002	NS	NS	P < 0.001(3), P < 0.001(6)
Cv	P < 0.001	NS	NS	NS	0.017	NS	0.001	NS	NS	P < 0.001(3), P < 0.001(6)
Ss Capillary	P < 0.001	P < 0.001	NS	NS	P < 0.001	NS	0.001	NS	NS	P < 0.001(3)