Table 4.
Univariate comparisons of baseline characteristics by cluster. For continuous variables, tabled values are means (standard deviations); for categorical variables, tabled values are counts (within cluster percentages).
| Low Use Responders (n=109) | High Use Responders (n=45) | Relapsers (n=25) | Non-Responders (n=15) | χ2 or F | |
|---|---|---|---|---|---|
| Demographic and study related | |||||
| Age | 15.59 (1.26) | 15.89 (1.25) | 16.16 (1.21) | 16.47 (1.30) | 3.21* |
| Race (white) | 65 (59.6%) | 29 (64.4%) | 14 (56.0%) | 6 (40.0%) | 2.89 |
| Sex (male) | 88 (80.7%) | 35 (77.8%) | 21 (84.0%) | 14 (93.3%) | 1.95 |
| Hollingshead 9-step SES | 6.12 (2.30) | 5.87 (2.32) | 5.74 (2.61) | 4.17 (2.62) | 3.02* |
| Contingency Management | 69 (63.3%) | 23 (51.1%) | 17 (68.0%) | 8 (53.3%) | 2.92 |
| Substance use | |||||
| Cannabis Dependencea | 26 (23.9%) | 30 (66.7%) | 6 (24.0%) | 7 (46.7%) | 27.78* |
| Mean cannabis uses per day | 1.43 (.66) | 2.33 (1.59) | 2.08 (1.44) | 2.65 (1.50) | 10.76* |
| Alcohol Abuse/Dependencea | 25 (22.9%) | 11 (28.2%) | 2 (8.0%) | 1 (6.7%) | 5.04 |
| Mean drinks per day | 3.32 (4.12) | 3.47 (4.07) | 3.58 (4.69) | 1.77 (1.84) | .78 |
| Psychopathology | |||||
| ADHDb | 55 (50.5%) | 18 (40.0%) | 12 (48.0%) | 3 (20.0%) | 5.63 |
| Internalizingb | 30 (27.5%) | 20 (44.4%) | 4 (16.0%) | 5 (33.3%) | 7.13 |
| Externalizingb | 48 (44.0%) | 34 (75.6%) | 13 (52.0%) | 7 (46.7%) | 12.93* |
*
p<0.05
a
Based on youth interview.
b
Based on youth or parent/guardian interview