Table 6.
Hierarchical Regression Evaluating the Concurrent Validity of the DEQ Items for use with Amphetamine, Nicotine, and Alcohol
| AMPHETAMINE (20mg) |
NICOTINEa (1mg) |
ALCOHOLb (.08g%) |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lifetime Stimulant Use | Daily # Cigarettes Smoked | Frequency of Alcohol Use (# Days in the Past Month) |
AUDIT (Past Month) |
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|
|
|
|
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| PREDICTORS | Δ R 2 | df | F | β | Δ R 2 | df | F | β | Δ R 2 | df | F | β | Δ R 2 | df | F | β | |
| STEP 1 | COVARIATES | .00 | (2, 236) | .27 | .00 | (3, 135) | .54 | .02* | (3, 290) | 3.44 | .05*** | (3, 290) | 5.77 | ||||
| SEX | −.04 | .00 | −.04 | −.15** | |||||||||||||
| RACE | -- | −.02 | .08 | .09 | |||||||||||||
| AGE | .11 | .11 | −.16** | −.15** | |||||||||||||
| STEP(S) 2 | DEQ ITEMS | ||||||||||||||||
| FEEL | .02** | (1, 235) | 6.30 | .16 | .00 | (1, 134) | .23 | −.04 | .04*** | (1, 289) | 11.77 | −.20 | .08*** | (1, 289) | 27.97 | −.29 | |
| HIGH | .03*** | (1, 235) | 9.39 | .20 | .00 | (1, 134) | .07 | −.02 | .00 | (1, 289) | 2.05 | −.08 | .04*** | (1, 289) | 12.68 | −.20 | |
| DISLIKE .01 | (1, 181) | 3.47 | −.14 | .00 | (1, 134) | .41 | .06 | -- | -- | -- | -- | -- | -- | -- | -- | -- | |
| LIKE | .04*** | (1, 235) | 13.11 | .23 | .02* | (1, 134) | 5.24 | −.19 | .05*** | (1, 289) | 17.74 | .24 | .05*** | (1, 289) | 17.20 | .24 | |
| MORE | .01* | (1, 235) | 4.76 | .14 | .02* | (1, 134) | 4.23 | −.18 | .06*** | (1, 289) | 20.67 | .26 | .14*** | (1, 289) | 51.85 | .39 | |
Note. Within the amphetamine study, lifetime stimulant use was used to evaluate the concurrent validity of the DEQ items. Within the nicotine study, the average number of cigarettes smoked per day was used to evaluate concurrent validity of the DEQ items. Within the alcohol study, the number of days participants consumed alcohol in the past month and AUDIT scores over the past month were used to evaluate concurrent validity of the DEQ items. Separate models were run for each DEQ item. Step 1 included sex, race, and age as covariates. Step 1 of the nicotine and alcohol regression models included sex, race, and age as covariates. The model for amphetamine did not include race because all participants were Caucasian. Step 1 results are presented only once (highlighted in gray) for each substance. Results from Steps 2 of each model are then presented. The significance levels depicted in the table do not reflect any corrections for multiple comparisons. However, all significant findings remained statistically significant after we employed false discovery rate (FDR) with a tolerance level for Type I error set to alpha = .05 with the exception of the results for nicotine (denoted in italicized font). Superscript “a” 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