Table 2.
Exploratory factor analysis—measure of subjective best self-interest—eigenvalues, explained variance, and factor loadings.
| Please take a moment to think of all the good and bad things that you believe can happen when using prescription stimulants nonmedically. With all of the good and bad things in mind, would you consider it to be in your best self-interest to use prescription stimulants nonmedically for the following reasons? | |
|---|---|
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| |
| It would be in my best self-interest to use prescription stimulants nonmedically to… | |
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| Factor 1 | |
| Eigenvalues | 19.46 |
| Explained variance (%) | 88.45 |
| Items | |
| …allow me to be more focused on something.2 | .97 |
| …help me concentrate better.2 | .97 |
| …make my focus crystal clear.1 | .96 |
| …help me pay attention really well.1 | .96 |
| …help me learn/work very efficiently.1 | .96 |
| …help my thoughts stay on track better.1 | .96 |
| …help me get my work done more efficiently.2 | .96 |
| …make my concentration excellent.1 | .95 |
| …make distractions disappear.1 | .95 |
| …help me absorb material the first time through.1 | .95 |
| …make me more productive with my school work.2 | .95 |
| …make my mind razor sharp.1 | .95 |
| …make my memory better.1 | .94 |
| …prevent my mind from wandering.1 | .93 |
| …make me get less bored by my work.2 | .93 |
| …help me ignore distractions more easily.1 | .93 |
| …make me enjoy studying/working a lot more.1 | .93 |
| …make my work seem more interesting.1 | .93 |
| …make my thoughts follow more logically.1 | .92 |
| …help me study/work for hours.1 | .92 |
| …make me need fewer breaks when studying/working.1 | .90 |
| …help me stay awake longer or all night.2 | .81 |
Note. Scale items denoted with 1 were adapted from the prescription stimulant expectancy questionnaire-II’s 20-item cognitive enhancement subscale (Looby & Earleywine, 2010). Items denoted with 2 were adapted from the stimulant medication outcome expectancy questionnaire’s 8-item academic subscale (Labbe & Maisto, 2010). Two items that did not reach a criterion greater than .50 (Meyers et al., 2006) in Looby and Earlywine’s (2010) original scale validation (“I don’t end up day dreaming” and “It’s no trouble to sit still”) were not included. Additionally, any items that were similar and thus redundant from the two scales were only included once.