Table 5.

Multinomial Regression Predicting Tobacco and Marijuana Co-use from Behavioral, Environmental, and Personal Variables.

	Either Tobacco or Marijuana (Lifetime) Use vs.	OR	p	95% CI
Behavioral
No Drug Use	No Use	4.99	.002	[1.81, 13.67]
	Co-Use	0.26	.001.	[0.13, 0.53]
No Alcohol Use	No Use	3.42	.001	[2.07, 5.63]
	Co-Use	0.38	.005	[0.19, 0.74]
Never ridden in car with drunk driver	No Use	0.68	.317	[0.32, 1.44]
	Co-Use	0.47	.050	[0.22, 1.00]
Never Arrested	No Use	2.01	.243	[0.61, 5.79]
	Co-Use	0.51	.165	[0.19, 1.33]
Grades: Mostly As and Bs	Reference Group
Grades: Mostly Cs	No Use	0.82	.492	[0.46, 1.47]
	Co-Use	1.04	.914	[0.53, 2.03]
Grades: Mostly Ds and Fs	No Use	0.24	.001	[0.11, 0.53]
	Co-Use	1.82	.157	[0.79, 4.17]
Environmental
Parental Monitoring	No-Use	1.03	.387	[0.99, 1.12]
	Co-Use	0.93	.083	[0.85, 1.01]
Friends who use drugs	No Use	0.69	.301	[0.34, 1.39]
	Co-Use	0.55	.078	[0.28, 1.07]
Friends who use Marijuana	No Use	2.71	.001	[1.43, 3.83]
	Co-Use	0.43	.012	[0.22, 0.83]
Been Cyberbullied	No Use	2.17	.068	[0.96, 4.94]
	Co-Use	1.33	.516	[0.57, 3.12]
Personal
Depression CESD- R	No Use	0.98	.083	[0.97, 1.00]
	Co-Use	0.99	.404	[0.969, 1.01]
Self-Reliance	No Use	0.98	.501	[0.94, 1.02]
	Co-Use	0.97	.225	[0.91, 1.02]
Social Commitment	No Use	1.04	.053	[1.00, 1.08]
	Co-Use	1.03	.325	[0.98, 1.08]
Self-Esteem	No Use	1.01	.798	[0.95, 1.07]
	Co-Use	1.04	.350	[0.96, 1.12]
Hope	No Use	1.01	.508	[0.97, 1.05]
	Co-Use	1.01	.636	[0.86, 1.06
Guilt	No Use	1.02	.232	[0.99, 1.07]
	Co-Use	1.05	.021	[1.01, 1.10]
Perceived Stress	No Use	1.04	.102	[0.99, 1.10]
	Co-Use	0.99	.629	[0.93, 1.05]
Personal Responsibility	No Use	0.99	.561	[0.97, 1.02]
	Co-Use	1.00	.800	[0.97, 1.04]

Notes:

Psuedo R² = .576, N = 936

Comparison group = Users of either tobacco or marijuana - but not both. Age was used as a covariate.