Table 3. Malondialdehyde, myeloperoxidase, glutathione and collagen levels in lung tissue.

	Control	Early  bleomycin+saline	Early bleomycin+montelukast	Late  bleomycin+saline	Late bleomycin+montelukast
	Mean±SD	Mean±SD	Mean±SD	Mean±SD	Mean±SD
MDA (nmol/g)	29.2±6.6	46.8±7.7*	32.0±6.6‡	43.0±5.7**	27.2±6.5‡
MPO (U/g)	10.8±2.7	32.8±7.8***	20.1±4.9‡	24.5±8.7*	13.6±2.4‡
GSH (μmol/g)	1.8±0.3	0.8±0.3***	1.4± 0.2**||	0.9±0.3***	1.8±0.3§
Collagen (μg/mg)	15.3±3.0	20.8±2.3†	14.5±2.1	29.6±9.1***	17.2±2.8§
MDA: Malondialdehyde; MPO: Myeloperoxidase; GSH: Glutathione; * p<0.01, ** p<0.05, *** p<0.001 vs. control group; ‡ p<0.05, || p<0.01, § p<0.001 vs. bleomycin+saline group in same term; † p<0.05 vs. late bleomycin + saline; Data are means ± standard deviations from eight rats for each group.