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NCT05499299 Clinical Trial

Volatility and Heterogeneity of Vaccine Sentiments Means Continuous Monitoring is Needed When Measuring Message Effectiveness

Vaccine Refusal Clinical Trial

Official title:
The Effect of Optimised Online Advertising on the Uptake of COVID-19 Vaccines in Hong Kong

Clinical Trial Details — Status: Completed

Administrative data
NCT number NCT05499299
Other study ID # UW21-428
Secondary ID
Status Completed
Phase N/A
First received
Last updated
Start date July 1, 2021
Est. completion date April 1, 2022

Study information
Verified date August 2022
Source The University of Hong Kong
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

The success of vaccination programs often depends on the effectiveness of the vaccine messages, particularly during emergencies such as the COVID-19 pandemic. The current suboptimal uptake of COVID-19 vaccines across many parts of the world highlights the tremendous challenges in overcoming vaccine hesitancy and refusal even in the context of a world-devastating pandemic. The investigators conducted a randomized controlled trial in Hong Kong to evaluate the impact of seven vaccine messages on COVID-19 vaccine uptake (with the government slogan as the control). The participants included 127,000 individuals who googled COVID-19-related information during July-October 2021.

Description:

This study aims to evaluate the effectiveness of using the Google advertising platforms on influencing the uptake of COVID-19 vaccines in Hong Kong. When completed, the rich database compiled through this proposed study will provide increased insight into vaccine hesitancy in Hong Kong. Insights from the optimised online advertising trial can aid in providing crucial technical and theoretical support to the relevant health authorities for any potential evidence-based policy intervention in addressing vaccine hesitancy issues or the public's concerns towards vaccines in Hong Kong.

Recruitment information / eligibility
Status Completed
Enrollment 127000
Est. completion date April 1, 2022
Est. primary completion date October 31, 2021
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group N/A and older
Eligibility Inclusion Criteria: - General users of Google search in Hong Kong Exclusion Criteria: - None

Study Design

Related Conditions & MeSH terms

Intervention

Behavioral:
• Google ads
Individuals who googled COVID-19 information in Hong Kong were randomized to see one of the seven ads and, if they clicked on the ads, the corresponding vaccine message on our website

Locations
Country Name City State
Hong Kong The University of Hong Kong Hong Kong

Sponsors (1)
Lead Sponsor Collaborator
The University of Hong Kong

Country where clinical trial is conducted

Hong Kong, 

Outcome
Type Measure Description Time frame Safety issue
Primary Number of bookings following each message delivery within 6 hours The number of bookings made within X = 6 hours following each message delivery 6 hours
Secondary Number of bookings following each message delivery within 3 hours The number of bookings made within X = 3 hours following each message delivery 3 hours
Secondary Number of bookings following each message delivery within 12 hours The number of bookings made within X = 12 hours following each message delivery 12 hours
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