Impact of Providing Health Information on Alcohol Labels in a Real-World Setting: a Randomized Controlled Trial Among Supermarket Customers in Barcelona
| Registry | NCT06915298 |
|---|---|
| Status | Completed |
| Phase | Not applicable |
| Study type | Interventional; randomized, parallel, masking: none, prevention |
| Enrollment | 1410 (Actual) |
| Sponsor | World Health Organization (Other); collaborators: IPSOS, Program on Substance Abuse, Public Health Agency, Government of Catalonia |
| Conditions | Knowledge, Behaviour Change, Risk Perception, Intention, Support for Alcohol Policies, Emotional Response, Product Appeal |
| Interventions | Alcohol health warning label - cancer, Responsibility message on alcohol label, Front label, Back label, Outcome pre-testing, No outcome pre-testing (Behavioral, other) |
| Dates | start 2025-04-23, primary completion 2025-07-25, completion 2025-07-25, first posted 2025-04-08, last updated 2025-08-06 |
| Locations | 1 site in Spain |
Related Papers Related Patents Related Grants Related Experts
All trials for Knowledge All trials for Behaviour Change All trials of Alcohol health warning label - cancer All trials of Responsibility message on alcohol label
The goal of this randomized controlled trial is to evaluate the impact of health information labeling on alcohol-related knowledge and behaviors in adults purchasing alcohol in Barcelona, Spain. The main questions it aims to answer are:
* Does a label containing a cancer message have a larger impact on knowledge, behavior, intentions, risk perception, emotional response, product appeal and policy support compared to a responsibility label?
* Does the positioning of the label (front vs. back) on the alcohol container affect these outcomes?
Researchers will compare the impact of cancer message labels vs. responsibility labels and front vs. back positioning to see if there are differences in the primary outcome (knowledge of alcohol causing cancer) and secondary outcomes (behavior, intentions, risk perception, emotional response, and policy support).
Additionally, the study will provide insight in whether there is a testing effect of primary outcome pre-measurement by exposing only half of the sample to baseline question on knowledge of alcohol related harms.
Participants will:
* Be recruited in front of selected supermarkets in Barcelona after purchasing alcohol for their own consumption.
* Complete a baseline questionnaire.
* Receive a sticker containing a randomly assigned health message that will be applied to every alcohol beverage they have purchased.
* Receive an invitation to complete two follow-up surveys, one a week and one a month after the intervention.
| Arm | Type | Interventions | Description |
|---|---|---|---|
| Responsibility message - front of the container / no pre-test | Active comparator | Behavioral: Responsibility message on alcohol label; Behavioral: Front label; Other: No outcome pre-testing | A sticker with a message to drink responsibly is applied to the front of the container. There is no question on knowledge of alcohol related harms at baseline. |
| Responsibility message - back of the container / no pre-test | Active comparator | Behavioral: Responsibility message on alcohol label; Behavioral: Back label; Other: No outcome pre-testing | A sticker with a message to drink responsibly is applied to the back of the container. There is no question on knowledge of alcohol related harms at baseline. |
| Cancer message - front of the container / no pre-test | Experimental | Behavioral: Alcohol health warning label - cancer; Behavioral: Front label; Other: No outcome pre-testing | A sticker with a message on alcohol causing cancer is applied to the front of the container. There is no question on knowledge of alcohol related harms at baseline. |
| Cancer message - back of the container / no pre-test | Experimental | Behavioral: Alcohol health warning label - cancer; Behavioral: Back label; Other: No outcome pre-testing | A sticker with a message on alcohol causing cancer is applied to the back of the container. There is no question on knowledge of alcohol related harms at baseline. |
| Responsibility message - front of the container / pre-test | Active comparator | Behavioral: Responsibility message on alcohol label; Behavioral: Front label; Other: Outcome pre-testing | A sticker with a message to drink responsibly is applied to the front of the container. There is a question on knowledge of alcohol related harms at baseline. |
| Responsibility message - back of the container / pre-test | Active comparator | Behavioral: Responsibility message on alcohol label; Behavioral: Back label; Other: Outcome pre-testing | A sticker with a message to drink responsibly is applied to the back of the container. There is a question on knowledge of alcohol related harms at baseline. |
| Cancer message - front of the container / pre-test | Experimental | Behavioral: Alcohol health warning label - cancer; Behavioral: Front label; Other: Outcome pre-testing | A sticker with a message on alcohol causing cancer is applied to the front of the container. There is a question on knowledge of alcohol related harms at baseline. |
| Cancer message - back of the container / pre-test | Experimental | Behavioral: Alcohol health warning label - cancer; Behavioral: Back label; Other: Outcome pre-testing | A sticker with a message on alcohol causing cancer is applied to the back of the container. There is a question on knowledge of alcohol related harms at baseline. |
Sex: All, ages: 18 Years to any, accepts healthy volunteers
Inclusion Criteria: * have just purchased at least one alcoholic beverage container for their own consumption * speak Spanish or Catalan * are 18 years or older * provide informed consent to participation Exclusion Criteria: \- all the purchased alcohol containers are too small for a label sticker to be affixed
| Facility | City | Country | Status |
|---|---|---|---|
| Sampled supermarkets in selected city neighbourhoods | Barcelona | Spain |