Table 1.

Lung morphometry

Experimental groups	Time points since the onset of CS exposure
	9 months		10 months		11 months
	Lm (μM)	ISA (cm2)	Lm (μM)	ISA (cm2)	Lm (μM)	ISA (cm2)
Control	41.6 ± 1.4	1,190 ± 11	41.7 ± 1.1	1,106 ± 9	42.0 ± 1.3	1,117 ± 7
CS	46.9 ± 1.3*	1,091 ± 41*	46.3 ± 1.4*	1,015 ± 9*	46.7 ± 1.7*	962 ± 8*

Note. Data are shown as mean ± SD, n = 6 for both experimental groups.

Abbreviations: CS, cigarette smoke; ISA, internal surface area of the lungs; Lm, mean linear intercept.

^* P < .05 versus control mice for each time point.