Table 3.

Correlations among white matter fractional anisotropy, treatment, and substance use

	Prefrontal	Orbitofrontal	Parietal	Temporal	Corpus callosum
Current conduct disorder (yes/no)	−.39*	−.37*	−.22	−.33	−.16
Full scale IQ score	.09	.12	.24	.29	−.17
Age at regular alcohol use	.50**	.36	.08	.23	.04
Age at regular marijuana use	.22	.21	.24	.25	.09
BL Alcohol Motivation to Abstain	−.49**	−.48**	−.11	−.46*	−.15
BL Marijuana Motivation to Abstain	.03	−.27	.20	.17	− −.12
Treatment days attended	.21	.02	−.08	.13	.06
Alcohol abstinent days pre-scan	−.13	−.06	−.15	−.01	−.12
Marijuana abstinent days pre-scan	.12	−.06	.09	.04	−.10
Alcohol use days prior to scan	.14	.13	.09	.19	−.03
Marijuana use days prior to scan	.12	.32	.00	.00	.40*
Alcohol frequency at 6-months	−.12	.00	−.20	−.17	.01
Marijuana frequency at 6-months	−.01	.18	.03	−.06	.35
6-month RAPI score	−.49**	−.45*	−.42*	−.47*	−.58**
6-month RMPI score	−.23	−.17	−.04	−.01	−.30
Total number of drinks at 6-mo	−.13	−.23	−.37*	−.36*	−.22

Notes: Ns range from 26–32 due to missing data for certain items.

^*p<.05,

^**p≤.01.

Current=past 6 months. BL Alc/MJ Motiv=Baseline motivation to abstain from alcohol/marijuana in the next 30 days. Treatment days= number of treatment days attended from the start of intensive outpatient treatment to scan day. Alcohol/Marijuana use days prior to scan=number of days of use in the 30 days prior to imaging. 6-mo: 6-month follow-up. RAPI/RMPI=Rutgers Alcohol/Marijuana Problems index at 6-months. Total drinks 6-mo= total number of drinks in the past 30 days at 6-month follow-up.