Table 2.

Effect of human neutrophil elastase on alveolar fractal box dimension (D_B) and mean linear intercept (L_m)

Time	Mean DB	SEM of DB	Lm	SEM of Lm
Controla	1.69	0.03	38.5	2.1
7	1.62	0.020	51.3	15.2
14	1.62	0.029	53.9	4.6
21	1.57*	0.026	60.4*	7.0

Notes:

^aSaline instilled controls were sacrificed 21 days postinstillation;

^*significantly different than controls.

Abbreviation: SEM, standard error of the mean.