Table 1. Baseline demographics and clinical characteristics.

Factor	Whole sample	Male (n = 134)	Female (n = 41)	p-value
Age M(SD)	24.0 (6.4)	24.3 (6.0)	23.0 (7.3)	.250
Caucasian N(%)	112 (64)	86 (64)	26 (63)	.929
Marital status N(%)
HS graduate N(%)	158 (90)	119 (89)	39 (95)	.232
Clinical characteristics M(SD)
SOCRATES
Recognition	19.75 (6.3)	20.02 (6.4)	18.85 (6.1)	0.29
Ambivalence	11.92 (3.8)	11.88 (3.8)	12.08 (3.7)	0.80
Taking steps	24.25 (6.9)	24.89 (6.9)	22.13 (6.4)	0.04
Self-efficacy	3.51 (1.0)	3.58 (1.0)	3.28 (0.7)	0.12
Past month use (ave oz./week)	5.25 (2.6)	5.41 (2.7)	4.70 (2.4)	0.17
Marijuana related problems	7.37 (3.7)	7.35 (3.9)	7.46 (3.2)	0.79
Inventory of Drug Taking Situations
Unpleasant emotions	49.01 (24.5)	45.51 (24.2)	60.68 (22.2)	0.001
Physical discomfort	38.46 (21.3)	36.35 (20.2)	45.47 (23.4)	0.02
Pleasant emotions	57.12 (20.6)	56.36 (20.9)	59.66 (19.5)	0.45
Testing personal control	24.22 (22.0)	23.89 (21.6)	25.30 (23.6)	0.87
Urges and temptations	50.45 (24.3)	48.05 (24.4)	58.46 (22.8)	0.01
Conflict with others	28.12 (23.8)	25.43 (22.8)	37.09 (25.2)	0.008
Social pressure	42.56 (25.7)	41.38 (25.8)	46.49 (25.4)	0.22
Pleasant time with others	62.20 (20.9)	61.95 (21.5)	63.07 (18.9)	0.79
Marijuana Effect Expectancy Questionnaire
Cognitive behavioral impairment	2.97 (.75)	2.93 (.75)	3.07 (.76)	0.41
Relaxation	3.69 (.69)	3.60 (.73)	3.96 (.48)	0.04
Social/sexual	3.06 (.63)	3.01 (.65)	3.20 (.54)	0.22
Perceptual and cognitive enhancement	3.29 (.68)	3.25 (.66)	3.45 (.73)	0.11
Global negative effects	1.77 (.57)	1.75 (.57)	1.85 (.59)	0.45
Craving/physical	3.92 (.74)	3.86 (.75)	4.07 (.73)	0.22
Marijuana Ladder	7.11 (1.5)	7.15 (1.6)	7.00 (1.1)	0.48