EMA_Normalization of Alcohol Drinking in Young Adults

NCT05689320 | Completed

• 1 other identifier: 27102621
• Study Type: interventional
• Target: 371
• Locations: 1 country
• Sites: 1

Brief Summary

This proposed study aims to evaluate incentive strategies on compliance rate of EMA, assess young adults' exposure to alcohol marketing, and its effect on receptivity outcomes, belief in normalization of alcohol drinking and alcohol consumption. The objectives are:

1. 1.To compare the compliance rate of EMA between participants receiving one-off bonus and incremental incentive and receiving incremental incentive only.
2. 2.To assess the association between exposure to alcohol marketing and drinking normalization, in terms of perceived popularity (descriptive norm), perceived social approval (injunctive norm) and positive expectancy.
3. 3.To assess the association between exposure to alcohol marketing and alcohol consumption.
4. 4.To assess the association between exposure frequency and receptivity to alcohol marketing.
5. 5.To assess the association between receptivity to alcohol marketing and drinking normalization.
6. 6.To assess the association between receptivity to alcohol marketing and alcohol consumption.
7. 7.To explore factor structure of perceived popularity (descriptive norm), perceived social approval (injunctive norm) and positive expectancy.
8. 8.To analyse drinking normalization effect in mediating the association between exposure to alcohol marketing, and alcohol consumption, and between receptivity and alcohol consumption.

Conditions

Alcohol Drinking

Keywords

Ecological Momentary Assessment; Alcohol marketing

Outcome Measures

Primary Outcomes (7)

• Compliance rate of EMA questionnaires

  All participant will be asked to answer the EMA questionnaires 3 times per day for consecutively 21 days. For each EMA survey, participants will have 30 mins to complete it. The compliance rate will be calculated by total number of completed EMA surveys divided by total numbers of EMA surveys (total n=63 surveys, 21 days × 3 surveys/day).

  3-week EMA period

• Exposure frequency to alcohol marketing

  In each EMA prompt, participants will be asked whether they have seen any alcohol marketing in the past 5 hours (except for the first EMA survey of the day, which asks about the period starting from the last EMA on the previous day rather than the past 5 hours), the channels of exposure, and types of alcoholic beverages.

  3-week EMA period

• Receptivity to alcohol marketing

  In each reported exposure in EMA, participants will be asked to rate five statements to examine their receptivity to alcohol marketing. The five sentences are as follows: (1) I like the ad; (2) I feel the main actors in the ads are attractive; (3) I feel the ad is creative; (4) the ad content/branding suits my personal image/status; and (5) drinking is portrayed as a positive behavior. These items will be rated on a 5-point Likert scale from 1 (strongly disagree) to 5 (strongly agree).

  3-week EMA period

• Perceived popularity of drinking

  Subjects will be asked to respond to some statements with various views on alcohol drinking. such as "Out of 10, how many drinkers do you think in your peers in Hong Kong?" (0-10 points, 0=not at all common, 10=very common).

  Baseline and 1-month follow-up

• Perceived social approval of drinking

  Participants will be asked to rate the extent they agree (from 1: strongly disagree to 5: strongly agree) with various views on alcohol drinking. such as "I accept myself to drink in public occasions".

  Baseline and 1-month follow-up

• Positive expectancy of drinking

  Participants will be asked 20 items to rate their extent of agreement (from 1: disagree to 4: agree) with various views on alcohol drinking. Such as "I would act sociable",

  Baseline and 1-month follow-up

• Negative expectancy of drinking

  Participants will be asked 18 items to rate their extent of agreement (from 1: disagree to 4: agree) with various views on alcohol drinking. Such as "I would be clumsy",

  Baseline and 1-month follow-up

Secondary Outcomes (3)

• Frequency of drunk

  Baseline and 1-month follow-up

• Alcohol consumption

  Baseline, 1-month follow-up and 3-week EMA period

• Auxiliary outcome

  1-month follow-up

Other Outcomes (11)

• Covariate 1

  Baseline and 1-month follow-up

• Covariate 2

  Baseline and 1-month follow-up

• Covariate 3

  Baseline and 1-month follow-up

Study Arms (2)

Intervention

EXPERIMENTAL

The intervention group will first receive 3 times EMA per day for 21 consecutive days. This assessment length was designed to capture participants' exposure to alcohol marketing for a long period of time. The EMA will include questions about self-reported exposure to and /or responses to alcohol marketing. The intervention group participants should complete at least two EMA surveys in a day and need to comply with the intervention at least 85% of the time.

Other: Behavioral: EMA-based intervention

Control

NO INTERVENTION

The control group will first receive 3 times EMA per day for 21 consecutive days. This assessment length was designed to capture participants' exposure to alcohol marketing for a long period of time. The EMA will include questions about self-reported exposure to and /or responses to alcohol marketing. The conrol group participants should complete at least two EMA surveys in a day and No intervention will be provided after completing the 21 consecutive days EMA documentation.

Interventions

Behavioral: EMA-based intervention OTHER

This study will compare the effect of fixed and incremental incentive strategies on compliance rates. All participants will be promised a basic incentive. An additional gift voucher will be given to intervention group participants who comply with the intervention at least 85% of the time, whereas a basic incentive will only be given to control group participants.

Intervention

Eligibility Criteria

• Age: 18 Years - 35 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Own a mobile smartphone with internet access
• Drank any alcohol in past 30 days (current drinkers)
• Will be in Hong Kong during the 3-week EMA study period
• Able to read and write in Chinese.

You may not qualify if:

• Did not drink any alcohol in the past 30 days
• Will not be in Hong Kong during the study period

Sponsors & Collaborators

• The University of Hong Kong: lead
• Research Grants Council, Hong Kong: collaborator

Study Sites (1)

LKS Faculty of Medicine

Hong Kong, Hong Kong, 00, Hong Kong

Location

MeSH Terms

Conditions

Alcohol Drinking

Condition Hierarchy (Ancestors)

Drinking Behavior; Behavior

Study Officials

• Derek YT Cheung, PhD

  The University of Hong Kong

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Assistant Professor

Study Record Dates

• First Submitted: December 30, 2022
• First Posted: January 19, 2023
• Study Start: January 26, 2023
• Primary Completion: June 30, 2023
• Study Completion: June 30, 2023
• Last Updated: April 6, 2025

Record last verified: 2025-04

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL
• Time Frame: 3 years after the completion of the relevant publications.

Locations

HK (1)