. Author manuscript; available in PMC: 2014 Jan 1.

Published in final edited form as: Addict Behav. 2012 Jul 28;38(1):1435–1441. doi: 10.1016/j.addbeh.2012.07.012

Table 4.

Hierarchical regressions predicting drug dependence symptoms at 18-month follow up.

	Full Sample (N=80)		Low-Frequency Users (n=41)		High-Frequency Users (n=39)

	ΔR²	β	ΔR²	β	ΔR²	β
Step 1	.30^**		.01		.13^†
fMRI protocol		.02		.04		−.01
Drug dependence symptoms at baseline		.54^**		−.07^**		.36^*

Step 2	.05^**		.02		.10^†
Substance use group		.23
Medial prefrontal cortex activation		−.22^‡		−.02		.39^*
Left angular gyrus activation		.17		.18		.13

Step 3	.02^**
Use group × medial prefrontal interaction		−.49
Use group × left angular gyrus interaction		−.07

^**

p < .01

p < .05

^†

p = .05

^‡

p = .07