Table 4.

Marijuana Use Motives Predicting Affect-Relevant Factors

	ΔR²	t (each predictor)	β	sr²	p
Criterion Variable: Positive Affect1
Step 1	.06				ns
Gender3		−1.17	−.10	.00	ns
Age at Onset of Marijuana Use		−.90	−.07	.00	ns
Marijuana Use4		1.41	.12	.01	ns
Tobacco Use5		−2.45	−.21	.04	< .05
Alcohol Consumption6		.31	.02	.00	ns
Step 2	.16				< .001
MMM – Enhancement7		4.61	.49	.13	< .001
MMM – Conformity8		.83	.07	.00	ns
MMM – Expansion9		−.06	−.00	.00	ns
MMM – Coping10		−3.13	−.30	.06	< .01
MMM – Social11		−.39	−.03	.00	ns
Criterion Variable: Negative Affect2
Step 1	.13				.001
Gender		1.38	.11	.01	ns
Age at Onset of Marijuana Use		1.03	.08	.00	ns
Marijuana Use		−1.17	−.09	.00	ns
Tobacco Use		4.56	.38	.13	< .001
Alcohol Consumption		.62	.05	.00	ns
Step 2	.11				< .01
MMM – Enhancement		−.93	−.09	.00	ns
MMM – Conformity		1.90	.16	.02	.05
MMM – Expansion		.43	.04	.00	ns
MMM – Coping		3.42	.33	.08	.001
MMM – Social		−1.38	−.13	.01	ns

Note: β = standardized beta weight

sr² = Squared semi-partial correlation

¹Positive Affect Negative Scale – Positive Affect subscale

²Positive Affect Negative Affect Scale – Negative Affect subscale

³Dichotomous Variable (1 = male; 2 = female)

⁴Marijuana History Questionnaire – Marijuana Use, Past 30 Days

⁵Smoking History Questionnaire – Number of Cigarettes Smoked per Day

⁶Alcohol Assessment: Alcohol Volume × Frequency of Use

⁷Marijuana Motives Measure – Enhancement Factor

⁸Marijuana Motives Measure – Conformity Factor

⁹Marijuana Motives Measure – Expansion Factor

¹⁰Marijuana Motives Measure – Coping Factor

¹¹Marijuana Motives Measure – Social Factor