Table 2.
Between-group outcome comparisons at 6 months after the end of detox treatment (n = 113)
| MI group | BA group | Unadjusteda | Adjustedb | |||
|---|---|---|---|---|---|---|
| n = 56 | n = 57 | |||||
| Mean (SE) | Mean (SE) | Mean difference (95% CI) | P-valuesc | Mean difference (95% CI) | P-valuesc | |
| Primary outcome | ||||||
| TSG affiliation score (AAAS) | 2.53 (0.33) | 1.51 (0.36) | 1.02 (0.06/1.98) | 0.037 | 0.91 (0.04/1.78) | 0.041 |
| Secondary outcomes | ||||||
| TSG meetings in the 6-month follow-up | 16.0 (3.8) | 8.2 (2.2) | 7.8 (−0.8/16.4) | 0.074 | 5.9 (−1.4/13.2) | 0.115 |
| Alcohol use and severity | ||||||
| Days of alcohol use in the last 30 days | 2.2 (0.8) | 5.4 (1.3) | −3.2 (−6.2/−0.2) | 0.038 | −3.5 (−6.5/−0.6) | 0.020 |
| Alcohol use severity score (EuropASI) | 0.17 (0.03) | 0.24 (0.03) | −0.07 (−0.15/0.02) | 0.112 | −0.06 (−0.14/0.01) | 0.095 |
| Drug use and severity | ||||||
| Days of drug use in the last 30 days | 4.8 (1.3) | 7.4 (1.6) | −2.6 (−6.6/1.5) | 0.217 | −4.0 (−7.5/−0.4) | 0.028 |
| Drug use severity score (EuropASI) | 0.11 (0.02) | 0.10 (0.01) | 0.01 (−0.03/0.06) | 0.608 | 0.00 (−0.03/0.03) | 0.862 |
| Patients with no alcohol or drug use past 30 days | ||||||
| Proportions of abstainers | 44% (7%) | 46% (7%) | −2% (−22/17%) | 0.825 | 0% (−20/18%) | 0.946 |
aControlled for cohort, otherwise unadjusted. bMean difference adjusted for cohort, baseline score on outcome variable and baseline characteristics, including gender, age, relationship status, education and severity scores (composite score on alcohol and drugs). cP-values obtained from generalized estimating equations (GEE) regression. AAAS = Alcoholics Anonymous Affiliation Scale; EuropASI = Addiction Severity Index, European version; MI = motivational intervention; BA = brief advice; CI = confidence interval; SE= standard error; TSG = 12-Step group.