Table 1.

Regression Analyses Among Adolescents (Ages 12 to 17) Residing in Colorado and Non-Medical Marijuana States Comparing Changes in 2006-2008 and 2009-2011 Controlling for Demographics: Odds Ratios (95% Confidence Intervals) or Beta Estimates (Standard Errors), and p-values

Independent Variable	Outcome Variable
Independent Variable	Perceive No Risk from Using Marijuana Regularly¹ (Missing=1.4%)	Perceive Great Risk from Using Marijuana Regularly¹ (Missing=1.4%)	Fairly/Very Easy to Get Marijuana¹ (Missing=3.0%)	Somewhat/Strongly Disapprove of Adults Trying Marijuana¹	Past Year Marijuana Use	Number of Days Used Marijuana in Past Year Among Past Year Users	20+ Days of Marijuana Use in the Past Month²	Marijuana Abuse/Dependence in the Past Year³
State
Colorado	0.86 (0.59, 1.26) p=0.4418	0.82 (0.69, 0.96) p=0.0181	1.38 (1.14, 1.68) p=0.0014	N/A	1.54 (1.18, 2.00) p=0.0020	−0.1 (0.12) p=0.3053	1.53 (1.00, 2.34) p=0.0485	1.44 (1.04, 1.99) p=0.0272
NMMS	REF	REF	REF	N/A	REF	REF	REF	REF
Year
2006-2008	REF	REF	REF	N/A	REF	REF	REF	REF
2009-2011	1.59 (1.48, 1.71) p=0.0000	0.76 (0.73, 0.79) p=0.0000	0.93 (0.90, 0.97) p=0.0007	N/A	1.04 (0.99, 1.10) p=0.1115	0.0 (0.03) p=0.4480	0.97 (0.85, 1.10) p=0.6308	0.98 (0.90, 1.08) p=0.7076
Exact Age	1.34 (1.31, 1.37) p=0.0000	0.79 (0.78, 0.80) p=0.0000	1.78 (1.76, 1.80) p=0.0000	N/A	1.76 (1.74, 1.79) p=0.0000	0.1 (0.01) p=0.0000	2.05 (1.95, 2.14) p=0.0000	1.67 (1.62, 1.72) p=0.0000
Gender
Male	1.85 (1.73, 1.99) p=0.0000	0.73 (0.71, 0.75) p=0.0000	0.92 (0.89, 0.95) p=0.0000	N/A	1.21 (1.15, 1.27) p=0.0000	0.3 (0.03) p=0.0000	1.84 (1.62, 2.10) p=0.0000	1.24 (1.13, 1.36) p=0.0000
Female	REF	REF	REF	N/A	REF	REF	REF	REF
Race/Ethnicity
White	REF	REF	REF	N/A	REF	REF	REF	REF
Black	1.40 (1.28, 1.53) p=0.0000	0.62 (0.59, 0.65) p=0.0000	1.03 (0.98, 1.08) p=0.2907	N/A	0.90 (0.84, 0.97) p=0.0045	0.0 (0.04) p=0.2343	0.71 (0.59, 0.85) p=0.0005	0.83 (0.73, 0.95) p=0.0060
Hispanic	0.75 (0.62, 0.90) p=0.0022	1.10 (1.00, 1.21) p=0.0495	0.64 (0.58, 0.72) p=0.0000	N/A	0.74 (0.64, 0.85) p=0.0000	−0.2 (0.08) p=0.0599	0.63 (0.46, 0.87) p=0.0059	0.70 (0.56, 0.87) p=0.0017
Other	1.21 (1.08, 1.34) p=0.0009	0.78 (0.74, 0.82) p=0.0000	0.91 (0.85, 0.96) p=0.0017	N/A	0.99 (0.92, 1.07) p=0.8032	0.0 (0.05) p=0.7743	0.78 (0.62, 0.97) p=0.0262	1.00 (0.86, 1.15) p=0.9820
State*Year Interaction
Colorado, 2006-2008	REF	REF	REF	N/A	REF	REF	REF	REF
Colorado, 2009-2011	1.90 (1.22, 2.96) p=0.0054	0.72 (0.57, 0.90) p=0.0048	1.16 (0.90, 1.48) p=0.2493	N/A	1.30 (0.95, 1.79) p=0.1020	0.0 (0.16) p=0.8254	0.70 (0.30, 1.64) p=0.4006	1.45 (0.97, 2.17) p=0.0684
NMMS, 2006-2008	REF	REF	REF	N/A	REF	REF	REF	REF
NMMS, 2009-2011	REF	REF	REF	N/A	REF	REF	REF	REF

N/A: Not applicable; REF=Reference cell.

NOTE: Odds ratios (95% confidence intervals) or beta estimates (standard errors) were obtained from multiple logistic or log-linear Poisson regression models with all independent variables included as covariates.

NOTE: States without medical marijuana laws included: Alabama, Arkansas, Connecticut, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, West Virginia, Wisconsin, and Wyoming.

Respondents with unknown data were excluded from model.

Non-users were coded as using 0 days.

Marijuana dependence or abuse is based on definitions found in the 4th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV).

Source: SAMHSA, Center for Behavioral Health Statistics and Quality, National Survey on Drug Use and Health, 2006-2010 (revised 3/12), 2011.