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Citation
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Baumann S, Staudt A, Freyer-Adam J, Bischof G, Meyer C, John U. Addiction 2021; ePub(ePub): ePub. |
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Abstract
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BACKGROUND AND AIMS: Evidence for efficacy of brief alcohol interventions (BAIs) is mostly limited to primary care and at-risk drinkers. The aim was to test the efficacy of a BAI addressing the full spectrum of alcohol use in a general population sample and across alcohol risk groups.
DESIGN: Two-parallel-group randomized controlled trial (allocation ratio 1:1) with post-baseline assessments at months 3, 6, and 12. SETTING: One municipal registry office in Germany responsible for registration, passport and vehicle admission issues. PARTICIPANTS: 1,646 proactively recruited 18-to-64-year-old adults with past year alcohol use (56% women, 66% low-risk drinkers) were randomized to intervention (n = 815) or control (n = 831). INTERVENTION AND COMPARATOR: The intervention consisted of assessment plus computer-generated individualized feedback letters at baseline, month 3, and month 6. Comparator was assessment only. MEASUREMENTS: Primary outcome was change in the self-reported number of drinks/week from baseline to 12 months. Changes at 3 and 6 months were secondary outcomes. Moderator was alcohol risk group (low-risk vs. at-risk drinking) according to the Alcohol Use Disorders Identification Test-Consumption, with scores ≤3 (women) and ≤4 (men) indicating low-risk drinking.
FINDINGS: For the whole sample, significant group differences were observed neither at 12-month follow-up (incidence rate ratio [IRR] = 1.01, 95% confidence interval [CI] = 0.87-1.17, Bayes factor [BE] = 0.52) nor at previous assessments (month 3: IRR = 1.01, 95% CI = 0.92-1.12, BE = 0.41; month 6: IRR = 0.93, 95% CI = 0.81-1.07, BE = 1.10). Moderator analyses revealed that low-risk drinkers were more likely to benefit from BAI only at month 6 than at-risk drinkers (IRR = 0.77, 95% CI = 0.70-0.86).
CONCLUSIONS: In a randomized controlled trial, there was no clear evidence for efficacy of a computer-based brief alcohol intervention in a general population sample, but there was some evidence of medium-term benefits in the large but understudied group of low-risk drinkers.
Language: en |