Table 2. Intracellular levels of reactive oxygen species in orbital fibroblasts before and after treatment with 200 μM H₂O₂.

ROS levels	Before treatment (mean±SD)	After treatment (mean±SD)	Induction ratio (%)* (mean±SD)	p -value
O2.- (Relative ratio**)
Normal	94.29±1.90	102.22±3.47	108±3	0.039
GO	105.54±3.45	118.87±2.92	113±2	<0.001
	p=0.004		p=0.055
H2O2 (Relative ratio**)
Normal	105.18±1.79	118.81±0.76	113±2	0.007
GO	123.19±5.84	152.97±6.61	124±6	0.002
	p=0.004		p=0.024

*Induction ratio=O₂^.- or H₂O₂ value after H₂O₂ treatment / baseline value (%). **Each measurement of cultured orbital fibroblasts was presented as a relative value, which was calculated by taking the intracellular ROS levels of the human skin fibroblasts CCD cell line as 100%.