Table 1.
Sample characteristics
| Substance Abusers (n = 40) |
Controls (n = 10) |
Test | |
|---|---|---|---|
| Demographic | |||
| Age at enrollment | 17.08(1.27) | 17.10(1.29) | t(48) = −.06, p = .96 |
| Last grade completed | 9.03(1.36) | 9.89(1.61) | t(44) = −1.64, p = .11 |
| Intelligence Quotient | 94.22(11.43) | 97.4(17.76) | t(44) = −.68, p = .50 |
| Left handed | 7.5% | 10% | X2(1) = 0.07, p = .79 |
| Race | |||
| White | 90% | 100% | X2(1) = 1.09, p = .30 |
| American Indian | 10% | 0 | |
| Ethnicity - Hispanic | 87.5% | 80.0% | X2(1) = 0.37, p = .54 |
| Psychopathy (PCL:YV) | |||
| Total score | 24.26(6.02) | 15.28(5.98) | t(48) = 4.23, p < .01 |
| Interpersonal/Affective Factor 1 | 6.91(3.69) | 4.70(2.83) | t(48) = 1.76, p = .08 |
| Interpersonal | 2.53(2.28) | 1.30(1.49) | |
| Affective | 4.38(1.82) | 3.40(1.65) | |
| Behavioral Factor 2 | 14.94(2.43) | 9.13(4.13) | t(48) = 5.82, p < .01 |
| Lifestyle | 6.90(1.73) | 3.40(1.78) | |
| Antisocial | 8.04(1.24) | 5.73(2.63) | |
| Substance Use History | |||
| Age regular use (any drug) | 11.15(2.44) | 13.00 (2.83)a | |
| Age regular use (stimulants) | 14.54(1.85) | – | |
| Days since last use | 138.80(129.55) | – | |
| % Regular use marijuanab | 97.5% | 20% | X2(1) = 32.55, p < .01 |
| % Regular use alcohol-high thresholdb- | 76.9% | 10% | X2(1) = 15.34, p < .01 |
| % Regular use opiatesb | 45.0% | 0% | X2(1) = 7.03, p < .01 |
Note.
a
–Average is based on the two subjects that regularly used marijuana only.
b
– Refers to regular use at any point in the past.