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. Author manuscript; available in PMC: 2013 Apr 29.

Published in final edited form as: J Clin Exp Neuropsychol. 2010 May 17;32(10):1110–1121. doi: 10.1080/13803391003757833

TABLE 3.

Multiple regression results

			R²	R²_Change	F _Change	Standardized beta	p value
Step 1	Covariates		.25	.25	F(4, 175) = 16.21		<.001^*
		Age				−.22	.001^*
		Methadone use				−.20	.003^*
		Days since last use				−.14	.04^*
		Sensation seeking				.32	<.001^*
Step 2	Main effects		.24	.00	F(4, 171) = 0.99		.42
		Emotional distress				.09	.20
		IGT				−.09	.17
		Stroop				−.03	.69
		DNM				.01	.90
Step 3	Interactions		.26	.02	F(3, 168) = 3.22		.02^*
		IGT × Emotional Distress				.15	.02^*
		Stroop × Emotional Distress				−.10	.11
		DNM × Emotional Distress				−.08	.25
Total model			.26	.26	F(11, 168) = 7.37		<.001^*

Note. IGT = Iowa Gambling Task. DNM = delayed nonmatching to sample.

^*

Significant at p < .05.