Table 1. Baseline characteristics of the clinical and community control samples.
| Variable | Clinical N = 260 % (n) or mean (SD) |
Community Controls N = 201 % (n) or mean (SD) |
Statistic | p value |
|---|---|---|---|---|
|
| ||||
| Gender | ||||
| Female | 13.5 (35) | 17.4 (35) | χ12=1.37 | 0.241 |
| Male | 86.5 (225) | 82.6 (166) | ||
|
| ||||
| Hispanic | 35.0 (91) | 34.8 (70) | χ12=0.002 | 0.969 |
|
| ||||
| Race | ||||
| White | 53.5 (139) | 54.7 (110) | χ22=0.16 | 0.923 |
| Black | 8.5 (22) | 9.0 (18) | ||
| Other (American Indian/Alaska Native, Asian and more than one race) | 38.1 (99) | 36.3 (73) | ||
|
| ||||
| Age at baseline interview (years) | 15.7 (1.2) | 15.7 (1.5) | t368.79 =0.02 | 0.988 |
|
| ||||
| Conduct disorder | 86.9 (226) | 24.9 (50) | χ12=181.65 | 0.0005 |
|
| ||||
| Number of conduct disorder symptoms | 5.8 (2.8) | 1.7 (2.2) | t458.68=-17.86 | 0.0005 |
|
| ||||
| Cannabis use disorder | 90.8 (236) | 15.4 (31) | χ12=264.05 | 0.0005 |
|
| ||||
| Alcohol use disorder | 71.9 (187) | 15.4 (31) | χ12=145.18 | 0.0005 |
|
| ||||
| Nicotine dependence | 59.2 (154) | 7.5 (15) | χ12=130.84 | 0.0005 |
|
| ||||
| Amphetamine use disorder | 18.8 (49) | 1.0 (2) | χ12=36.72 | 0.0005 |
|
| ||||
| Cocaine use disorder | 16.2 (42) | 1.0 (2) | χ12=30.17 | 0.0005 |
|
| ||||
| Opioid use disorder | 6.9 (18) | 0.5 (1) | χ12=11.85 | 0.001 |
|
| ||||
| Number of substance use disorders (not including nicotine) | 2.4 (1.5) | 0.4 (0.8) | U=4583.50 | 0.0005 |
|
| ||||
| Onset age of marijuana use (years) | 11.9 (2.0) (n=256) |
13.3 (2.3) (n=63) |
t317=4.65 | 0.0005 |
Note: Sample sizes vary because of missing data.