Table 2: The mean malondialdehyde (n mol/l) of blood plasma of mice exposed to dust.

Exposure time	Group 1	Group 2	Group 3	Group 4	Group 5	Control
1 month	3.8±0.52	5.2±2.5	4.06±2.7	3.2±1	1.53±0.66	4.3±2.8
2 month	5.1±0.152	4.7±0.95	3.8±0.66	4.1±0.57	3.23±0.57	1.5±0.47
3 month	7.3±0.57	6.1±0.78	5.5±1.09	5.9±0.85	4.3±1.1	1.3±0.2
4 month	8.4±0.41	6.8±0.57	6.6±0.43	6.6±0.38	6.1±0.57	1.8±0.58
p-value	0.001	0.001	0.003	0.001	0.26	-