. Author manuscript; available in PMC: 2015 Sep 29.

Published in final edited form as: Subst Use Misuse. 2014 Nov 14;50(3):292–301. doi: 10.3109/10826084.2014.977396

TABLE 3.

Generalized estimating equation models for use motives influence on marijuana quantity, frequency, and use-related problems at age 25

	Marijuana quantity			Marijuana frequency			Marijuana problems
	B	SE	p	B	SE	p	B	SE	p
Pos Reinf	0.08	0.01	<.0001	0.17	0.02	<.0001	0.13	0.02	<.0001
Neg Reinf	0.00	0.01	.54	−0.00	0.02	.99	0.05	0.02	.04
Expansion	−0.07	0.03	.01	−0.09	0.03	.007	−0.07	0.04	.14
Sex	0.08	0.03	.02	0.06	0.04	.15	0.04	0.05	.40
MJCov	0.02	0.01	.13	0.04	0.01	.003	−0.05	0.02	<.0001
Model	χ² (df = 5) = 158.94		<.0001	χ² (df = 5) = 321.17		<.0001	χ² (df = 5) = 121.75		<.0001

Note: Pos Reinf = positive reinforcement motives to use marijuana; Neg Reinf = negative reinforcement motives to use marijuana; Expansion = expansion motives to use marijuana; MJCov = marijuana engagement covariate across time (quantity for quantity, frequency for frequency, and problems for problems); B = unstandardized coefficient; SE = standard error. All outcomes and MJCov were log transformed.