Table 4.

Subgroup analyses for reactive oxygen species in depression

Subgroup	Category	Effect model	Depression
			Number of studies	Hedges’ g (95% CI)	p-value	I2 (%)
Medication history	No medication	Random	3	0.504 (-0.143 to 1.152)	0.127	56.0
	On medication	Random	2	-0.040 (-0.892 to 0.812)	0.926	93.9

CI: confidence interval, I²: I-square