Table 2.
Principal components analysis factor loadings
| Measure | Factor 1 |
|---|---|
| DKEFS Color-Word Inhibition | .81 |
| DKEFS Color-Word Inhibition Switching | .70 |
| DKEFS Trail Making Test Number-Letter Switching | .77 |
| DKEFS Tower Test Total | .57 |
| Measure | Factor 1 (‘Severity’) | Factor 2 (‘Frequency’) |
|---|---|---|
| MAWQ | .79 | −.03 |
| MAUQ | .70 | .05 |
| DSM-5 symptoms | .72 | .25 |
| 30-day TLFB Methamphetamine use days | .23 | .41 |
| Age of First Methamphetamine Use | −.05 | −.82 |
| Years of Regular Methamphetamine Use | −.03 | .82 |
Note. DKEFS = Delis-Kaplan Executive Function System; TLFB = Timeline Follow-Back; MAUQ = Methamphetamine Urge Questionnaire; MAWQ = Methamphetamine Withdrawal Questionnaire.