Table 2.

Stereological measures of lungs of pre-/postnatally exposed mice and controls at P40.

Parameter	Mean ± SD		p
	Exposed	Control
Animal weight (g)	19.4 ± 1.6	18.5 ± 1.0	0.32
Lung volume (mm3)	92 ± 28	109 ± 10	0.22
vol/wt ratio (mm3·g−1)	4.7 ± 1.3	5.9 ± 0.7	0.11
ND of alveoli (103 mm−3)	9.73 ± 2.09	13.73 ± 1.08	0.005**
N of alveoli (106)	0.91 ± 0.38	1.51 ± 0.22	0.02*
$\overline{\text{V}}$ of alveoli (103 μm3)	53.7 ± 10.0	39.2 ± 4.2	0.02*
Vf of alveoli (%)	50.8 ± 5.0	53.5 ± 2.6	0.33
Vf of alveolar septa (%)	39.5 ± 2.3	36.3 ± 3.2	0.11
Vf of airways (%)	6.7 ± 2.5	7.4 ± 2.9	0.68
Vf of vessels (%)	2.9 ± 1.6	2.8 ± 1.2	0.88
Vt of alveoli (mm3)	47.5 ± 17.1	58.5 ± 6.6	0.22
Vt of alveolar septa (mm3)	35.9 ± 9.6	39.8 ± 5.5	0.46
Vt of airways (mm3)	5.9 ± 2.4	8.1 ± 3.4	0.26
Vt of vessels (mm3)	2.5 ± 1.3	3.0 ± 1.3	0.56
SD of alveolar septa (mm−1)	192.5 ± 40.3	219.8 ± 24.3	0.23
SD of airways (mm−1)	18.5 ± 7.1	16.7 ± 1.5	0.59
SD of vessels (mm−1)	45.6 ± 13.4	61.1 ± 45.6	0.49
SA of alveolar septa (cm2)	184.5 ± 86.7	241.2 ± 40.1	0.22
SA of airways (cm2)	15.8 ± 5.4	18.3 ± 3.0	0.39
SA of vessels (cm2)	42.8 ± 21.5	67.7 ± 52.7	0.36

N_D: number density, N: total number, $\overline{V}$: mean volume, V_f: volume fraction, V_t: total volume, S_D: surface density, S_A: surface area.