Health warnings in booze app put to the test
NCT ID NCT07116447
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether showing health warning messages in a mobile app where people buy alcohol affects their purchasing. Over 11,700 adults in Sweden took part. One group saw rotating health warnings, while the other saw standard messages. The researchers tracked purchases and surveyed participants to see if the warnings changed knowledge, risk perception, or buying behavior.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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11,719 people
The number who actually took part.
- Started
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Sep 2025
- Finished
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Dec 2025
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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20 years and older
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * minimum alcohol purchase age in Sweden (20+) * have downloaded the Systembolaget app and have given permission to the app to track in-app analytics * understand Swedish language Exclusion Criteria: * not of minimum alcohol purchase age in Sweden * no permission to track in-app analytics * no understanding of Swedish language
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Systembolaget mobile app
Stockholm, Sweden
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Other studies related to the condition(s) this trial covers.
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