Table 4.

Observed Prevalence of Marijuana-Related Behaviors and Attitudes among U.S. 10^th and 8^th Graders, by Year and California Residency (Weighted), Standard Errors in Parentheses

Marijuana Outcome	---Year---
	2007	2008	2009	2010	2011	2012	2013
10th GRADE
Past 30 day use (n=104,953)
California	.14 (.01)	.13 (.01)	.18* (.01)	.20* (.02)	.19 (.02)	.17 (.02)	.18 (.02)
Not California	.14 (.01)	.14 (.01)	.16 (.01)	.16 (.01)	.17 (.01)	.17 (.01)	.18 (.01)
Past 12-mo use (n=104,987)
California	.25 (.01)	.24 (.01)	.31** (.01)	.32 (.02)	.30 (.02)	.29 (.03)	.29 (.03)
Not California	.24 (.01)	.24 (.01)	.26 (.01)	.27 (.01)	.29 (.01)	.28 (.01)	.30 (.01)
Lifetime use (n=105,143)
California	.32 (.01)	.30 (.02)	.36** (.01)	.37 (.03)	.36 (.03)	.35 (.03)	.35 (.03)
Not California	.31 (.01)	.30 (.01)	.32 (.01)	.33 (.01)	.34 (.01)	.33 (.01)	.36 (.01)
Perceived high risk of regular use (n=94,073)
California	0.65 (.02)	0.64 (.02)	0.56* (.02)	0.56 (.02)	0.55 (.03)	0.51 (.02)	0.49 (.03)
Not California	0.66 (.01)	0.67 (.01)	0.62 (.01)	0.59 (.01)	0.57 (.01)	0.53 (.01)	0.48 (.01)
Strong disapproval of regular use (n=94,183)
California	0.61 (.02)	0.62 (.02)	0.55 (.02)	0.51*(.03)	0.54 (.03)	0.53 (.02)	0.51 (.02)
Not California	0.63 (.01)	0.63 (.01)	0.60 (.01)	0.59 (.01)	0.57 (.01)	0.56 (.01)	0.51 (.01)
Perceived availability (n=96,405)
California	0.74 (.02)	0.72 (.02)	0.79**(.02)	0.77 (.02)	0.75 (.03)	0.74 (.02)	0.74 (.02)
Not California	0.73 (.01)	0.72 (.01)	0.74 (.01)	0.74 (.01)	0.73 (.01)	0.73 (.01)	0.75 (.01)
8th GRADE
Past 30 day use (n=107,772)
California	.06 (.01)	.05 (.01)	.07 (.03)	.09 (.02)	.10 (.02)	.09 (.02)	.07 (.01)
Not California	.06 (.004)	.06 (.004)	.06 (.004)	.08 (.006)	.07 (.005)	.06 (.005)	.07 (.005)
Past 12-mo use (n=107,814)
California	.10 (.01)	.10 (.02)	.12 (.04)	.15 (.03)	.17** (.03)	.15* (.02)	.13 (.02)
Not California	.10 (.01)	.11 (.01)	.12 (.005)	.13 (.01)	.12 (.01)	.11 (.01)	.13 (.01)
Lifetime use (n=107,898)
California	.13 (.02)	.12 (.02)	.17 (.05)	.19 (.03)	.22*(.04)	.20 (.02)	.16 (.02)
Not California	.14 (.01)	.15 (.01)	.16 (.01)	.17 (.01)	.16 (.01)	.15 (.01)	.17 (.01)
Perceived high risk of regular use (n=94,782)
California	0.76 (.03)	0.70 (.04)	0.68 (.02)	0.65 (.04)	0.65 (.02)	0.61** (.03)	0.63 (.01)
Not California	0.77(.01)	0.75 (.01)	0.73 (.01)	0.71 (.01)	0.71 (.01)	0.71 (.01)	0.64 (.01)
Strongly disapproval of regular use (n=94,846)
California	0.69 (.04)	0.71 (.05)	0.68 (.06)	0.65 (.04)	0.65 (.04)	0.65** (.04)	0.69 (.02)
Not California	0.75 (.01)	0.74 (.01)	0.73 (.01)	0.70 (.01)	0.72 (.01)	0.71 (.01)	0.68 (.01)
Perceived availability (n=92,703)
California	0.39 (.03)	0.37 (.02)	0.41 (.06)	0.48 (.03)	0.51* (.04)	0.44 (.03)	0.45 (.02)
Not California	0.41 (.01)	0.44 (.01)	0.44 (.01)	0.45 (.01)	0.41 (.01)	0.40 (.01)	0.43 (.01)

Note: Reported sample sizes are unweighted.

^*p<.05; prevalence significantly different among California as compared to non-California residents in this year

^**p<.01; prevalence significantly different among California as compared to non-California residents in this year