• Am J Prev Med · Feb 2023

    Randomized Controlled Trial

    Designing Effective Alcohol Warnings: Consumer Reactions to Icons and Health Topics.

    • Anna H Grummon, Phoebe R Ruggles, Thomas K Greenfield, and Marissa G Hall.
    • Department of Nutrition, Harvard TH Chan School of Public Health, Boston, Massachusetts.
    • Am J Prev Med. 2023 Feb 1; 64 (2): 157166157-166.

    IntroductionNew warning labels for alcohol could reduce alcohol-related health harms. This study examined consumer responses to alcohol warnings with different designs.MethodsA national sample of 3,051 U.S. adults completed an online survey in August 2021. Participants were randomized to 1 of 4 warning topics (addiction, liver damage, early death, or colon cancer). Participants viewed 3 labels, presented in random order: 2 types of warning labels (text-only and icon) showing a newly developed warning message about their assigned topic and a text-only control label showing a neutral message. Participants rated each label on effectiveness at discouraging alcohol consumption (primary outcome) and attention (secondary outcome) using 1 to 5 Likert-type scales. Participants also rated warnings with different causal language variants (e.g., "increases risk of," "contributes to") and marker words (e.g., "WARNING," "SURGEON GENERAL WARNING").ResultsBoth the text-only and icon warnings were perceived as more effective (Average Differential Effects [ADEs]=0.79 and 0.86, respectively) and more attention-grabbing (ADEs=0.43 and 0.69, respectively) than control labels (all ps<0.001). The icon warnings were rated as more effective and attention-grabbing than the text-only warnings (ADEs=0.07 and 0.27, respectively, both ps<0.001). Although all warning topics outperformed the control messages, warnings about addiction were rated as less effective and attention-grabbing than the other topics. A majority (60%) of participants selected "increases risk of" as the most discouraging causal variant and a plurality (47%) selected "SURGEON GENERAL WARNING" as the most discouraging marker word.ConclusionsNew alcohol warnings could discourage alcohol consumption, especially if warnings include icons.

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