Table 1.

Baseline Demographic and Marijuana Use.

Variable	Full Sample (n = 87)	Included Sample (n = 61)	Excluded Sample (n = 26)
Age	35.6 (8.7)	35.1 (8.1)	36.9 (10.1)
Gender (male)	74.7%	78.7%	65.4%
Race	86.2% White	88.5% White	80.8% White
Education (years)	14.2 (1.8)	14.0 (1.8)	14.5 (1.9)
Age first smoked marijuana	14.7 (3.0)	14.3 (3.0)	15.4 (3.0)
Age first smoked daily	19.8 (6.1)	19.0 (6.0)	21.5 (6.0)
Percent days abstinent (of 90)	15.7 (17.5)	14.0 (16.5)	19.6 (19.3)
SCID Abuse symptoms	1.6 (0.7)	1.6 (0.8)	1.6 (0.6)
SCID Dependence symptoms	5.7 (1.1)	5.8 (1.0)	5.6 (1.3)
SOCRATES
Problem recognition	29.3 (4.2)	29.6 (4.1)	28.7 (4.5)
Ambivalence	16.5 (2.5)	16.6 (2.5)	16.3 (2.7)
Taking steps	27.6 (7.0)	26.8 (7.4)	29.3 (6.0)