Table 2.
Differences in Past 3-Month Drug Use/Misuse Frequency on a Continuous Scale by Study Group to Baseline Versus 3-Month Follow-up
| Control Group (n = 327) |
Treatment Group (n = 306) |
||||||
|---|---|---|---|---|---|---|---|
| Substance Categories | Baseline, x̄(SE) |
3-Month Follow-up, x̄(SE) |
Baseline −3-Month Follow-up Δ1x̄ (95% CI) |
Baseline, x̄(SE) |
3-Month Follow-up, x̄(SE) |
Baseline −3-Month Follow-up, Δ2x̄ (95% CI) |
Control Group - Treatment Group, Δ1x̄ - Δ2x̄ (95% CI) |
| Marijuana | 3.56 (0.12) | 3.09 (0.13) | 0.47 (0.28 to 0.68) | 3.64 (0.12) | 2.88 (0.14) | 0.76 (0.54 to 0.99) | −0.29 (−0.59 to 0.02) |
| Cocaine or crack | 0.69 (0.08) | 0.44 (0.07) | 0.25 (0.12 to 0.38) | 0.74 (0.09) | 0.46 (0.07) | 0.28 (0.13 to 0.44) | −0.03 (−0.24 to 0.16) |
| Methamphetamines | 0.17 (0.04) | 0.10 (0.03) | 0.07 (−0.02 to 0.16) | 0.13 (0.04) | 0.08 (0.03) | 0.05 (−0.01 to 0.13) | 0.02 (−0.11 to 0.12) |
| Inhalants | 0.11 (0.03) | 0.08 (0.03) | 0.03 (−0.03 to 0.09) | 0.10 (0.04) | 0.06 (0.02) | 0.04 (−0.02 to 0.12) | −0.01 (−0.11 to 0.08) |
| Hallucinogens | 0.15 (0.04) | 0.13 (0.04) | 0.02 (−0.08 to 0.12) | 0.09 (0.03) | 0.06 (0.02) | 0.03 (−0.02 to 0.08) | −0.01 (−0.12 to 0.10) |
| Illicit opioids | 0.37 (0.07) | 0.23 (0.05) | 0.14 (0.00 to 0.27) | 0.32 (0.06) | 0.38 (0.08) | −0.06 (−0.18 to 0.05) | 0.20 (0.01 to 0.37) |
| Gamma hydroxy butyrate (GHB) | 0.02 (0.01) | 0.03 (0.02) | −0.01 (−0.05 to 0.03) | 0.01 (0.01) | 0.03 (0.02) | −0.02 (−0.06 to 0.00) | 0.01 (−0.04 to 0.07) |
| Amphetamines | 0.19 (0.04) | 0.17 (0.04) | 0.02 (−0.09 to 0.12) | 0.12 (0.05) | 0.11 (0.04) | 0.01 (0.01 to 0.17) | 0.01 (−0.21 to 0.06) |
| Benzodiazepines | 0.56 (0.08) | 0.47 (0.07) | 0.09 (−0.05 to 0.25) | 0.44 (0.07) | 0.32 (0.06) | 0.12 (−0.03 to 0.27) | −0.03 (−0.24 to 0.20) |
| Barbiturates | 0.06 (0.03) | 0.03 (0.02) | 0.03 (−0.04 to 0.10) | 0.02 (0.01) | 0.03 (0.02) | −0.01 (−0.06 to 0.02) | 0.04 (−0.05 to 0.12) |
| Methadone | 0.20 (0.05) | 0.18 (0.05) | 0.02 (−0.08 to 0.12) | 0.20 (0.05) | 0.22 (0.06) | −0.02 (−0.12 to 0.10) | 0.04 (−0.12 to 0.18) |
| Prescription opioids | 0.87 (0.09) | 0.70 (0.08) | 0.17 (−0.02 to 0.37) | 0.75 (0.09) | 0.60 (0.09) | 0.15 (0.00 to 0.30) | 0.02 (−0.22 to 0.27) |
| Total drugs including marijuana | 6.94 (0.32) | 5.63 (0.31) | 1.31 (0.57 to 2.11) | 6.63 (0.28) | 5.20 (0.34) | 1.43 (0.83 to 2.04) | −0.10 (−1.12 to 0.87) |
| Total drugs excluding marijuana | 3.37 (0.32) | 2.55 (0.28) | 0.82 (0.18 to 1.51) | 2.98 (0.28) | 2.32 (0.32) | 0.66 (0.14 to 1.15) | 0.16 (−0.65 to 1.02) |
x̄ = mean; SE = standard error.