Table 3.
Non-categorical sociodemographic and substance use characteristics for respondents (N = 839) reporting past 12-month use of cocaine only (n = 144), opioids only (n = 622) or both (n = 73): means and standard errors listed
| Variables | Cocaine Only | Opioid Only | Both | Overall | Anova p-val |
|---|---|---|---|---|---|
| Sociodemographic variable | |||||
| Age | 31.18 (0.95) | 34.98 (0.62)a | 27.88 (1.62)b | 33.66 (0.50) | <.001 |
| Age of onset of drug use | |||||
| Cocaine | 22.18 (0.44) | –– | 19.51 (0.45) | 21.14 (0.37) | <.001 |
| Opioids | –– | 25.72 (0.57) | 19.31 (0.69) | 24.94 (0.51) | <.001 |
| Past 12-month frequency of drug use | |||||
| Cocaine1 | 4.28 (0.22) | 0 | 3.81 (0.30) | 4.09 (0.19) | .312 |
| Opioids1 | 0 | 2.62 (0.21) | 3.51 (0.65) | 2.73 (0.20) | .218 |
| Past 12-month alcohol use | |||||
| Drinks per drinking day | 5.75 (0.53) | 3.96 (0.24)b | 7.35 (0.91)a | 4.59 (0.20) | <.001 |
| Peak drinks in a day | 11.17 (1.03) | 8.02 (0.43)b | 16.37 (1.63)a | 9.37 (0.38) | <.001 |
Groups with differing superscript numbers differed at p ≤ .01
1
2 = 2 times per year, 3 = 3–6 times per year, 4 = 7–11 times per year