. Author manuscript; available in PMC: 2014 May 1.

Published in final edited form as: Psychopharmacology (Berl). 2012 Dec 28;227(1):177–192. doi: 10.1007/s00213-012-2954-z

Table 3.

The Ability of the DEQ Items to Differentiate Substance Effects from Placebo Effects and Dose Effects

Substance (dose)	Active Substance versus Placebo
	Effect Sizes (Cohen’s D)
	Feel Effects	Feel High	Dislike/Bad Effects	Like Effects	Want More Drug
Amphetamine (10mg)^b only unipolar	.47^***	.40^***	-.24^**	.68^***	.53^***
Amphetamine (20mg)^a only unipolar	1.03^***	.93^***	-.24^*	1.27^***	1.10^***

Nicotine^a (.5mg)	1.25^***	1.02^***	.46^***	.85^***	.64^***
Nicotine (1mg)	1.27^***	1.19^***	.49^***	.70^***	.53^***

Alcohol^b (peak BAC of .04g%)	1.12^***	.72^***	--	.36^*	.34^***
Alcohol (peak BAC of .08g%)	2.15^***	1.56^***	--	.56^***	.62^***

	High vs. Low Dose

Amphetamine (20mg vs. 10mg)	.56^***	.54^***	.01	.54^***	.54^***
Nicotine (1mg vs. 0.5mg)	.05	.14^*	.02	.06	.10
Alcohol (.80g/kg vs. .40g/kg)	2.26^***	.87^***	--	.45^***	.23^***

Note. The table depicts the magnitude of paired-samples t-tests evaluating differences in each of the DEQ items by condition (i.e., placebo versus substance administration) as well as differences by dose.

denotes that within the nicotine study, “I feel bad effects” was used in the absence of an item specifically assessing “DISLIKE.”

Superscript “b” denotes that within the alcohol study LIKE and DISLIKE were assessed using a single bipolar scale ranging from “dislike very much” to “like very much.”

p < .05

^**

p < .01

^***

p <.001