Address Tobacco Use Among Adolescents in Hong Kong

Study Overview
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Brief Summary
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This study will examine the effectiveness of a social norms campaign in correcting smoking misperceptions, reducing smoking susceptibility and changing smoking-related behaviours in Hong Kong adolescents.

Detailed Description
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The study involves a behavioural intervention with social norms approaches to correct smoking misperceptions, reduce smoking susceptibility and change smoking-related behaviours in Hong Kong adolescents. A 2-arm stratified clustered randomised controlled trial (RCT) will be conducted to evaluate the effectiveness of the intervention. A total of 18 secondary schools will be randomly selected from the 5 regions in Hong Kong and invited to the RCT. The schools will then be randomly allocated to intervention or control group in the ratio of 1:1. Secondary 1 to 5 (US Grade 7 to 11) students will be invited. Students in both intervention and control group will complete a baseline survey, and the intervention group will receive the intervention after the baseline. Intervention materials includes posters and table tents at school, flyers to students, and online banner on school website. The intervention adopts social norms approaches, and will highlight the prevalence of adolescents who do not smoke and have no intention to smoke. It will last for 2 months. Both intervention and control groups will complete follow-up surveys at 3 and 9 months. The control group will receive the intervention materials after the RCT.

Official Title
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Changing Social Norms Around Smoking: A Cluster Randomized Controlled Trial to Address Tobacco Use Among Adolescents in Hong Kong

Conditions
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Tobacco Use

Intervention / Treatment
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* Behavioral: Social norms campaign


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Local secondary schools that cover grades 1-6 Exclusion Criteria: International secondary schools Special schools for adolescents with visual, hearing or other physical impairments or disabilities

Ages Eligible for Study
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Minimum Age: 11 Years
Maximum Age: 20 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Intervention<br>Students in the schools assigned to the intervention group will receive the intervention after the baseline survey. The intervention will be a social norms campaign involving posters, table tents, flyers and an online banner. | Behavioral: Social norms campaign<br>* Intervention messages will mainly highlight the prevalence of Hong Kong adolescents who do not smoke cigarettes and have no intention to smoke cigarettes. The messages will be conveyed to students through posters, table tents, flyers and an online banner. Posters will be posted at prominent places in schools, table tents will be placed in school canteens, flyers will be distributed to students, and the online banner will be placed at the school website. The intervention will last for 2 months.<br>|
| No Intervention: Control<br>Students in the schools assigned to the control group will not receive anything during the randomised controlled trial. They will receive the intervention materials after the trial. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Perceived adolescent smoking prevalence | Perceived prevalence of current smoking secondary school students in Hong Kong | At the time of survey | 
| Smoking susceptibility | Intention to smoke in the next 12 months, if good friends are smoking in front, and if a good friend offered a cigarette | At the time of survey | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Smoking intensity | Number of smoking days in the past 30 days, average daily cigarette consumption | Past 30 days | 
| Intention to quit | Intention to quit | At the time of survey | 
| Quit attempts | Number of quit attempts | Past 3 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Social norms, Adolescent, Smoking, Randomised controlled trial