Table 1.

Demographic, readiness and self-efficacy, and behavioral risks among marijuana using and nonusing young adult drinkers

Variable	Marijuana users (n = 118) % or mean (SD)	Nonusers (n = 97) % or mean (SD)	Total % or mean (SD)	t	χ2
Demographic characteristics
Age	20.3 (1.7)	20.9 (2.0)	20.6 (1.9)	2.51, 213 df*
Gender, male	57.3%	42.7%	66.5%		1.04, 1/213 df
Ethnicity/race					10.15, 1/213 df‡
White	62.3%	37.7%	70.2%
Hispanic	36.4%	63.6%	10.2%
Black	38.5%	61.5%	12.1%
Other	37.5%	62.5%	7.4%
College status, in college	58.2%	41.8%	36.7%		0.59, 1/213 df
Readiness and self-efficacy
Readiness to change alcohol	5.4 (2.7)	5.9 (2.8)	5.6 (2.7)	1.01, 146 df
Confidence to resist heavy drinking	68.4 (19.6)	74.6 (18.6)	70.9 (19.4)	1.79, 126 df§
Behavioral risks
No. of drinking days	8.9 (6.5)	5.9 (5.3)	7.5 (6.2)	−3.71, 213 df‡
No. drinks per week	16.2 (13.8)	7.6 (8.1)	12.8 (12.4)	−4.33, 213 df‡
No. heavy drinking days	6.0 (5.8)	2.9 (3.2)	4.6 (5.0)	−4.89, 213 df‡
Any illicit drugs used, past-30-day use	75.8%	24.2%	15.3%		6.86, 1/213 df*
AUDIT score	12.3 (6.4)	9.6 (6.1)	11.1 (6.4)	−3.15, 213 df†
RAPI score	20.1 (17.1)	13.8 (12.1)	17.3 (15.3)	−3.12, 213 df†

Notes: AUDIT = Alcohol Use Disorders Identification Test; RAPI = Rutgers Alcohol Problem Index.

^§ p <.10

^* p <.05

^† p <.01

^‡ p <.001.