A Preliminary Study of Functional Brain Activation among Marijuana Users during Performance of a Virtual Water Maze Task

Table 1

Demographic and marijuana use data.

	MJ (n = 10)	NU (n = 18)
Age (years)	20.3 ± 3.6	22.8 ± 5.0
	(Age range: 18–30)	(Age range: 18–33)
Education (years)	13.4 ± 1.5	15.5 ± 2.4
Ethnicity (Caucasian/non-Caucasian)^a	9/0	11/7
SES^b	43.4 ± 10.6	49.1 ± 12.2
Age of MJ onset	15.6 ± 1.2	—
Smokes per week	10.7 ± 5.5	—
Grams per week^c	4.8 ± 4.9	—
Duration of use (yrs)	4.0 ± 2.4	—
ASI (MJ use out of 30 days)	25.5 ± 4.0	—
MWC	2.0 ± 2.1	—
THC (ng/mL)	193.5 ± 219.2	—

Data represent mean ± standard deviation. MJ: marijuana; NU: nonusers; SES: Socioeconomic status; ASI: Addiction Severity Index; MWC: Marijuana
Withdrawal Check List. ^aOne missing data point for MJ user. Non-Caucasian
classification consisted of Asian, African American, and others.
^bOne missing data point for NU. ^cTwo missing data points for grams per week.