Table 1.
Baseline sociodemographic characteristics of the sample (n = 710) and comparison of substance use pattern classes on baseline sociodemographic characteristics
| Variable | Full sample | Methamphetamine | Crack cocaine | Powder cocaine | Polysubstance | χ2 (df) | p |
| Male, % (n) | 61.4 (426) | 58.2 (95) | 53.3 (95) | 69.3 (113) | 61.6 (127) | 6.3 (3) | .099 |
| White, % (n) | 67.9 (482) | 98.2 (160) | 25.2 (45) | 57.6 (94) | 86.4 (178) | 236.4 (3) | <.001 |
| Age, M (SD) | 32.5 (10.4) | 31.3 (9.9) | 39.6 (8.8) | 30.9 (9.6) | 29.2 (9.8) | 106.7 (3) | <.001 |
| Not married, % (n) | 48.5 (344) | 41.1 (67) | 41.0 (73) | 55.8 (91) | 52.9 (109) | 12.8 (3) | .005 |
| High school graduate, % (n) | 41.3 (293) | 34.9 (57) | 44.9 (80) | 50.3 (82) | 27.6 (57) | 22.7 (3) | <.001 |
| Employed, % (n) | 32.2 (229) | 41.7 (68) | 25.2 (45) | 32.5 (53) | 29.6 (61) | 6.5 (3) | .090 |
| Insured, % (n) | 27.5 (195) | 34.9 (57) | 23.0 (41) | 25.7 (42) | 23.7 (49) | 4.8 (3) | .189 |
Note: Bold indicates significant differences among the four classes on that characteristic.