Table 2.
Change in substance use, mental health and sex risk outcomes for the overall sample (n=56) and by intervention exposure
| Outcomes | Overall sample (n=56) | Intervention dosage of up to and including four sessions (n=23) | Intervention dosage of five or more sessions (n=33) | ||||
| Baseline | 3-month follow-up | Baseline to follow-up Mean difference (95% CI) |
Baseline | 3-month follow-up | Baseline | 3-month follow-up | |
| Substance use outcomes | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | M (SD) | |
| Days of heavy drinking in past month | 8.4 (6.1) | 5.3 (6.9) | 3.2 (0.9 to 5.4)* | 8.8 (6.7) | 6.7 (8.2) | 8.1 (5.8) | 4.3 (5.8)* |
| Days of cannabis use in past month | 12.3 (12.4) | 6.0 (9.2) | 6.3 (2.6 to 9.9)* | 14.1 (13.5) | 4.7 (7.7)* | 11.1 (11.5) | 6.7 (9.8)* |
| Days of methamphetamine in past month | 19.5 (11.0) | 11.7 (11.3) | 7.8 (1.8 to 13.7)* | 22.0 (9.3) | 9.2 (11.4)* | 17.0 (12.3) | 14.2 (11.0) |
| Days of methaqualone in past month | 14.9 (11.8) | 9.9 (11.4) | 4.9 (−0.7 to 10.5) | 15.3 (10.6) | 7.6 (9.5)* | 14.4 (13.6) | 12.5 (13.2) |
| Cannabis positive (biological), N (%) | 26 (46.4) | 21 (37.5%)* | − | 13 (56.5) | 11 (47.8)* | 13 (39.4) | 10 (30.3)* |
| Methamphetamine positive (biological), N (%) | 25 (44.6) | 20 (35.7%)* | − | 11 (47.8) | 9 (39.1)* | 14 (42.4) | 11 (33.3)* |
| Methaqualone positive (biological), N (%) | 27 (48.2) | 21 (37.5)* | − | 13 (56.5) | 10 (43.5)* | 14 (42.4) | 11 (33.3)* |
| Mental health outcomes | |||||||
| CES-D score | 26.3 (9.6) | 17.7 (7.3) | 8.5 (5.3 to 11.7)* | 24.7 (8.9) | 17.3 (7.5)* | 27.5 (10.1) | 18.1 (7.2)* |
| K-10 score | 25.7 (6.9) | 17.8 (7.3) | 7.9 (5.6 to 10.3)* | 25.4 (7.2) | 17.6 (8.3)* | 25.9 (6.8) | 17.7 (6.5)* |
| Trauma symptom score | 32.9 (7.6) | 21.7 (8.6) | 11.2 (8.8 to 13.6)* | 33.9 (3.5) | 22.2 (7.8)* | 33.4 (6.7) | 21.7 (9.2)* |
| MOS-SSS | 60.6 (14.1) | 63.5 (15.7) | −2.8 (−6.7 to 1.1) | 60.5 (14.5) | 63.8 (16.6) | 60.8 (14.1) | 63.3 (15.3) |
| Sex risk outcome | |||||||
| Number of partners in last month | 1.7 (1.1) | 1.0 (0.4) | 0.6 (0.3 to 1.1)* | 2.1 (2.2) | 1.2 (0.7)* | 1.4 (0.6) | 0.9 (0.4)* |
| Condom use at last sex, N (%) | 8 (14.5) | 25 (45.5) | − | 2 (8.7) | 10 (43.5) | 6 (18.8) | 15 (46.9) |
| STI symptoms in past month | 1.1 (0.9) | 0.2 (0.8) | 0.8 (0.5 to 1.2)* | 0.8 (1.1) | 0.3 (1.0)* | 1.3 (0.8) | 0.2 (0.6)* |
*Significant at p<0.05.
CES-D, Centre for Epidemiologic Studies Depression Scale; K-10, 10-item Kessler Psychological Distress Scale; MOS-SSS, Medical Outcomes Study Social Support Survey; STI, sexually transmitted infection.