Table 2.

Descriptive Statistics for Marijuana (MJ) Use

Variable	%	M	SD
Age of first use of MJ (in years)		15.24	2.40
Age when began using MJ regularly (in years)		17.22	2.50
Typical number of joints per MJ use episodea		2.25	1.48
Real-time number of joints per MJ use episodeb		2.85	2.23
Typical reports of “high” during MJ use episodesc		6.95	1.34
Real-time reports of “high” during MJ use episodesc		5.85	1.50
Marijuana Problems Index (MPI) total score		41.95	11.99
Typical Pattern of MJ Use
Weekly user (at least once/week)	22
Daily user (at least once/day)	66
Other pattern of use	12
Typical Method of MJ Used
Blunt	49
Bowl/Bong	44
Joint	3
One-hitter	3
Frequency of MJ purchasing
Several times per week	46
Once per week	29
One to three times per month	25
Money spent on single MJ purchase
<$25	48
$25 – $50	33
>$50	19
Monthly dollars (USD) spent on MJ
<$100	27
$100–$200	44
>$200	29

Note. N = 57 – 59. All reports of MJ joints were for average-sized joints (approx. ½ gram/joint). Participants who smoked MJ using other methods (e.g., bowl, bong, blunt) were trained to convert the quantity of MJ they smoked into average-sized joints.

^aMean of two items from the Marijuana Use Questionnaire and Marijuana Acquisition and Use Questionnaire.

^bBased on Interactive Voice Response (IVR) reports made just after marijuana use.

^cRatings of high were made using a 10-point scale that ranged from 0 (Not at all high) to 9 (Extremely high).

^dIngestion and vaporizer also were response choices for this question, but were not endorsed.