Table 1.
Baseline Characteristics by Intervention (n = 332)
| Total (n = 332) |
Control (n = 169) |
MI (n = 163) |
t (p = ) | |
|---|---|---|---|---|
| Age (Yrs) | 20.5 (±1.8) | 21.0 (±1.8) | 20.5 (±1.7) | 0.50 (.617) |
| Prop. Days Used MJ | .57 (±.34) | .55 (±.34) | .59 (±.34) | −1.07 (.285) |
| Years Regular MJ Use | 3.92 (±2.58) | 4.05 (±2.48) | 3.79 (±2.67) | 0.95 (.345) |
| Marijuana Problem Severity (range 0–24) |
4.90 (±4.68) | 4.99 (±4.71) | 4.82 (±4.66) | 0.33 (.738) |
|
χ2 (p =) |
||||
| Ethnicity | ||||
| Caucasian | 225 (67.8%) | 107 (63.3%) | 118 (72.4%) | 4.35 (.226) |
| African-American | 35 (10.5%) | 18 (10.7%) | 17 (10.4%) | |
| Hispanic | 38 (11.5%) | 22 (13.0%) | 16 (9.8%) | |
| Other | 34 (10.2%) | 22 (13.0%) | 12 (7.4%) | |
| Some College or Degree | 232 (69.9%) | 121 (71.6%) | 111 (68.1%) | 0.48 (.487) |
| Met MJ Dependence | 131 (39.6%) | 67 (39.6%) | 64 (39.5%) | 0.00 (.979) |
| Any Desire to Quit Using | 200 (60.2%) | 108 (63.5%) | 92 (56.8%) | 1.57 (.210) |
| n (%) 1-Mo. Assessment | 283 (85.2%) | 149 (88.2%) | 134 (82.2%) | 2.34 (.126) |
| n (%) 3-Mo. Assessment | 264 (79.5%) | 138 (81.7%) | 126 (77.3%) | 0.97 (.325) |
| n (%) 6-Mo. Assessment | 262 (78.9%) | 136 (80.5%) | 126 (77.3%) | 0.50 (.479) |
| n (%) At Least 1 FU | 302 (90.1%) | 159 (94.1%) | 143 (87.7%) | 4.07 (.044) |
MJ=marijuana
FU=follow-up