Study on Lung Injury Caused by Fine Particulate Matter and Intervention Effect of Rhodiola wallichiana

Table 3

Expression of 4-HNE in each group of rats by immunohistochemical staining analysis (average optical density).

Group	N	4-HNE
Blank control group	10	0.175 ± 0.029^a
Normal saline group	10	0.180 ± 0.023^a
PM2.5-infected group	10	1.673 ± 0.394^b
Rhodiola wallichiana group	10	1.069 ± 0.117^c
F		112.9
		＜0.0001

The same letters indicate nonstatistical differences, ; different letters indicate statistical differences, .