Table 2.

Statistics from Regression Models Examining Interactions between Amount of Cannabis Use and Neuropsychological Performance on Marijuana Problems Scale Scores

Variable	Lifetime Cannabis Use			12 month Cannabis Use			30 day Cannabis Use
Variable	R²	β	p	R²	β	p	R²	β	p
HVLT (Immediate Recall)	*.16*		*.04*	.11		.12	.08		.27
Cannabis Use (sqrt)		*.37*	*.009*		*.28*	*.04*		.22	.14
HVLT		.26	.07		.21	.13		.20	.16
Cannabis Use x HVLT		−.001	.97		.05	.72		.02	.90
IGT (Net Total)	*.18*		*.02*	*.16*		*.04*	*.17*		*.03*
Cannabis Use (sqrt)		.15	.32		.03	.87		−.02	.92
IGT		−.20	.18		−.20	.18		−.19	.18
Cannabis Use x IGT		*−.33*	*.04*		*−.36*	*.03*		*−.40*	*.009*

Note. Statistically significant findings are indicated by bolded and italicized numbers; R² and associated p-values are for omnibus models; HVLT, Hopkins Verbal Learning Task; IGT, Iowa Gambling Task