Table 1.
Demographics and drug use of all study subjects
| Testaχ21, Z, or t28 | ControlN = 15 | CocaineN = 15 | |
|---|---|---|---|
| Gender: Male/female | 0.7 | 10/5 | 12/3 |
| Race: African-American/Caucasian/Hispanic/Asian | 7.63 | 8/5/1/1 | 14/0/1/0 |
| Laterality quotient (Oldfield, 1971) | −0.3 | 0.92 ± 0.03 | 0.91 ± 0.03 |
| Age (years) | 1.7 | 39.6 ± 1.8 | 43.6 ± 1.4 |
| Education (years) | −1.3 | 14.5 ± 0.6 | 13.4 ± 0.5 |
| Verbal IQ: Wide Range Achievement Test III, Reading scale (Wilkinson, 1993) | −0.6 | 102.5 ± 2.4 | 100.5 ± 2.6 |
| Nonverbal IQ: WASI, Matrix reasoning scale (Wechsler, 1999) | −0.1 | 11.0 ± 0.8 | 10.9 ± 0.5 |
| Depression: Beck Depression Inventory II (Beck et al., 1996) | −0.3 | 3.3 ± 1.0 | 4.4 ± 1.4 |
| Socioeconomic status: Hollingshead index | −1.2 | 38.0 ± 3.7 | 32.3 ± 3.0 |
| Cigarette smokers (current or past/nonsmokers) | 8.6* | 4/11 | 12/3 |
| Daily cigarettes (current smokers: N = 3/11) | −0.2 | 10.0 ± 4.0 | 9.6 ± 1.9 |
| Time since last cigarette (within 4 h/>4 h/overnight or more) | 1.12 | 1/2/0 | 5/4/2 |
| Age of onset of cocaine use (years) | 24.9 ± 1.6 | ||
| Duration of cocaine use (years) | 15.7 ± 1.1 | ||
| Days/week of cocaine use during the last 30 d | 3.6 ± 0.6 | ||
| Duration of current abstinence (days) | 5.1 ± 1.1 | ||
| Withdrawal symptoms: 18-item CSSA (0–126) (Kampman et al., 1998) | 11.0 ± 2.0 | ||
| Cocaine craving: 5-item questionnaire (0–45) (Tiffany et al., 1993) | 16.3 ± 2.3 |
Values are frequencies or means ± SEM (unless otherwise indicated). WASI, Wechsler Abbreviated Scale of Intelligence; CSSA, Cocaine Selective Severity Assessment Scale.
aχ2 tests were used for categorical variables, Mann-Whitney U for continuous non-normally distributed variables, and t test for normally distributed continuous variables.
*p < 0.01.