Hyperoxia accelerates progression of hepatic fibrosis by up-regulation of transforming growth factor-β expression

Table 2 Difference in the degree of hepatic fibrosis among the three groups

Diagnosis	Number of rats
	Control group	Hypoxia group	Hyperoxia group
	(n = 10)	(n = 10)	(n = 10)
Periportal fibrosis	2	0	0
Septal fibrosis	6	2	1
Cirrhosis	2	81	92

¹P = 0.009 vs control group;

²P = 0.003 vs control group.