Table 5.

Subgroup Analyses for FA in combined ROIs.

			95% Confidence Interval
	NStudies	g	Lower	Upper	Z	Test of Homogeneity
Polysubstance Abuse Included	5	−0.32	−0.58	−0.07	−2.48*	χ2 (4) = 7.94 (ns)
Polysubstance Abuse Excluded	6	−0.41	−0.64	−0.18	−3.45*	χ2 (5) = 7.32 (ns)
Polysubstance Overall Between						χ2 (1) = 0.07 (ns)
Random Effects
Cocaine Use	5	−0.37	−0.79	0.05	−1.74	χ2 (4) = 9.95*
Methamphetamine Use	5	−0.32	−0.57	−0.07	−2.49	χ2 (4) = 2.65 (ns)
Fixed Effects
Cocaine Use	5	−0.34	−0.60	−0.08	−2.58*
Methamphetamine Use	5	−0.32	−0.57	−0.07	−2.49*
Stimulant Type Overall Between						χ2 (1) = 0.04 (ns)