Table 6.
Ranked change scores of substance use at the four follow-up assessments (change from baseline in average amount per substance using day)
| Control | Therapy | Increase in probability of improvement in therapy group* | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | Abstinent or near abstinent | Large decrease | Small decrease | Small increase | Large increase | n | Abstinent or near abstinent | Large decrease | Small decrease | Small increase | Large increase | |||
| Main substance | ||||||||||||||
| 6 months | 143 | 12 (8.4) | 24 (16.8) | 42 (29.4) | 16 (11.2) | 49 (34.3) | 142 | 13 (9.2) | 26 (18.3) | 49 (34.5) | 21 (14.8) | 33 (23.2) | 14% | |
| 12 months | 132 | 13 (9.8) | 23 (17.4) | 32 (24.2) | 19 (14.4) | 45 (34.1) | 134 | 20 (14.9) | 31 (23.1) | 38 (28.4) | 13 (9.7) | 32 (23.9) | 29% | |
| 18 months | 125 | 22 (17.6) | 19 (15.2) | 30 (24.0) | 11 (8.8) | 43 (34.4) | 125 | 26 (20.8) | 28 (22.4) | 34 (27.2) | 6 (4.8) | 31 (24.8) | 24% | |
| 24 months | 113 | 20 (17.7) | 20 (17.7) | 23 (20.4) | 12 (10.6) | 38 (33.6) | 125 | 27 (21.6) | 20 (16.0) | 32 (25.6) | 16 (12.8) | 30 (24.0) | 13% | |
| Average | 20% | |||||||||||||
| All substances | ||||||||||||||
| 6 months | 148 | 8 (5.4) | 21 (14.2) | 43 (29.1) | 21 (14.2) | 55 (37.2) | 143 | 8 (5.6) | 21 (14.7) | 47 (32.9) | 27 (18.9) | 40 (28.0) | 9% | |
| 12 months | 136 | 9 (6.6) | 19 (14.0) | 34 (25.0) | 23 (16.9) | 51 (37.5) | 137 | 15 (10.9) | 30 (21.9) | 36 (26.3) | 20 (14.6) | 36 (26.3) | 30% | |
| 18 months | 128 | 16 (12.5) | 20 (15.6) | 31 (24.2) | 14 (10.9) | 47 (36.7) | 127 | 18 (14.2) | 25 (19.7) | 39 (30.7) | 9 (7.1) | 36 (28.3) | 23% | |
| 24 months | 115 | 11 (9.6) | 22 (19.1) | 26 (22.6) | 9 (7.8) | 47 (40.9) | 127 | 17 (13.4) | 21 (16.5) | 33 (26.0) | 20 (15.7) | 36 (28.3) | 9% | |
| Average | 18% | |||||||||||||
All values are n (%). Abstinent or near abstinent: −100% to −80% change from baseline; Large decrease: −79% to −40% change from baseline; Small decrease: −39% to 0% change from baseline; Small increase: +1% to +20% change from baseline; Large increase: more than 20% change from baseline.
*Percentage increase in the proportion of participants who reduced substance use (“abstinent or near abstinent,” “large decrease,” and “small decrease” categories) in therapy group compared with controls.