Table 1.

Descriptive Statistics

	Baseline	6 Months	9 Months	12 Months	15 Months	Sig
Use and Related Outcomes
Cannabis Use (Days)	37.07 (15.06)	29.62 (20.27)	30.09 (21.38)	29.01 (22.07)	30.45 (22.19)	**
Cannabis Problems	1.61 (.45)	1.41 (.62)	1.28 (.60)	1.26 (.71)	1.31 (.81)	**
Cannabis Symptoms	3.65 (2.60)	2.65 (2.76)	2.04 (2.50)	1.97 (2.65)	2.15 (2.92)	**
Motives
Alcohol	1.43 (0.64)	1.37 (0.78)	1.29 (0.67)	1.22 (0.80)	1.28 (0.83)	**
Altered Perception	2.48 (1.17)	2.29 (1.25)	2.19 (1.31)	2.01 (1.34)	2.09 (1.40)	**
Social Anxiety	2.11 (1.02)	1.70 (0.99)	1.52 (0.98)	1.34 (0.91)	1.48 (1.07)	**
Availability	2.82 (1.05)	2.64 (1.23)	2.44 (1.33)	2.32 (1.36)	2.37 (1.41)	**
Boredom	2.45 (1.04)	2.32 (1.26)	2.15 (1.22)	2.06 (1.34)	2.10 (1.31)	**
Celebration	2.51 (1.05)	2.15 (1.08)	2.04 (1.19)	1.90 (1.22)	1.89 (1.19)	**
Conformity	1.16 (0.39)	1.17 (0.58)	1.10 (0.57)	1.07 (0.65)	1.17 (0.76)
Coping	1.95 (1.07)	1.62 (1.04)	1.54 (1.11)	1.42 (1.00)	1.49 (1.09)	**
Enjoyment	4.00 (0.98)	3.53 (1.35)	3.31 (1.47)	3.13 (1.60)	3.07 (1.58)	**
Experimentation	1.44 (0.70)	1.34 (0.79)	1.26 (0.81)	1.18 (0.79)	1.33 (0.95)	**
Sleep	2.56 (1.22)	2.18 (1.28)	1.98 (1.23)	1.85 (1.21)	1.96 (1.29)	**
Relative Low Risk	2.54 (1.20)	2.20 (1.38)	2.05 (1.32)	1.87 (1.32)	1.95 (1.35)	**

Note: significant values represent repeated measures GLM analyses of time

^**p-values are significant at the 0.01 level

^*p-values are significant at the 0.05 level