Table 1. Demographic information and group differences for recreational stimulant users and healthy control subjects.
| Characteristic |
Recreational users |
Control subjects |
t/χ2 | P | ||
|---|---|---|---|---|---|---|
| Mean | s.d. | Mean | s.d. | |||
| Male: female | 12:12 | 18:14 | 0.22 | 0.64 | ||
| Age (years) | 28.54 | 6.78 | 30.91 | 8.14 | 1.15 | 0.25 |
| Education (years) | 13.29 | 1.78 | 13.03 | 1.99 | 0.51 | 0.61 |
| Verbal IQ (NART) | 116.32 | 5.25 | 113.58 | 8.12 | 1.39 | 0.17 |
| Impulsivity (BIS-11) | 62.92 | 10.68 | 58.44 | 7.25 | 1.87 | 0.07 |
| Sensation seeking | 23.04 | 5.13 | 18.28 | 5.91 | 3.15 | <0.01 |
| Compulsivity (Padua Inventory) | 4.33 | 2.82 | 7.72 | 7.45 | 2.11 | 0.04 |
| Depression (BDI-II) | 4.04 | 4.43 | 2.47 | 2.18 | 1.75 | 0.09 |
| Mean number of cigarettes | 5.17 | 5.78 | 4.25 | 6.59 | 0.34 | 0.74 |
| Alcohol use (AUDIT) | 5.79 | 1.56 | 3.00 | 2.31 | 5.10 | <0.01 |
| Compulsivity (OCDUS) | 1.25 | 1.67 | ||||
| Duration of stimulant use (years) | 8.08 | 6.18 | ||||
| Age of stimulant use onset (years) | 20.42 | 3.39 | ||||
Abbreviations: AUDIT, Alcohol Use Disorders Identification Test, cut-off score for alcohol abuse >8; BDI-II, Beck Depression Inventory–II; BIS-11, Barratt Impulsivity Scale Version 11; IQ, intelligence quotient; NART, National Adult Reading Test; OCDUS, stimulant-related Obsessive-Compulsive Drug Use Scale.