. Author manuscript; available in PMC: 2012 Nov 1.

Published in final edited form as: Drug Alcohol Depend. 2011 Apr 29;118(2-3):475–478. doi: 10.1016/j.drugalcdep.2011.03.023

TABLE 2.

Main Effects and Interaction Effects for Treatment Condition and Depressive Symptoms on Outcomes.

		MI		RT		Tx Effects		Dep. Effects		Tx by Dep. Effects
		Dep. Symptoms		Dep. Symptoms		Tx Effects		Dep. Effects		Tx by Dep. Effects

		High	Low	High	Low	F^a	Eta²	F^a	Eta²	F^a	Eta²

RCQ-M	M^b	.145	.109	.183	.266	7.43 (1,176)	.041^c	.28 (1,176)	.002^d	2.56 (1,176)	.014^d
	SD^b	.203	.155	.223	.296	p ≤ .007		p ≥ .500		p ≥ .100
	N	65	31	59	26
RCQ-A	M^b	.069	.088	.089	.147	2.80 (1,176)	.016^d	3.85 (1,176)	.021^d	.93 (1,176)	.005^d
	SD^b	.117	.155	.149	.209	p ≤ .096		p ≤ .051		p ≥ .300
	N	65	31	59	26

Note. MI = Motivational Interviewing; RT = Relaxation Training; Tx = treatment; Dep = depression; N = number of participants; M = mean; SD = standard deviation. Abbreviations: RCQ-A is Risks and Consequences Questionnaire-Alcohol; RCQ-M is Risks and Consequences Questionnaire-Marijuana.

F-statistic provided with degrees of freedom and associated p-levels.

Data shown are not log transformed.

Medium effect size (ES; Cohen, 1988).

Small ES. Eta² is partial Eta².