A Randomized Controlled Trial Evaluating an Online Intervention in Increasing Seasonal Influenza Vaccination Among Community Dwelling People Aged ≥65 Years

Study Overview
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Brief Summary
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A non-blinded two-arm parallel randomized controlled trial will be conducted. Inclusion criteria are: 1) aged ≥65 years, 2) having Hong Kong ID, 3) Chinese speaking, 4) willing to be followed up by telephone, 5) having a smartphone, and 6) have not received SIV for the incoming flu season. Exclusion criteria include: 1) cognitive impairment, blindness or deafness, 2) not able to communicate with others effectively, and 3) with known contradictions of SIV (allergic to previous SIV, diagnosed/suspected egg allergy, with bleeding disorder or on warfarin). A total of 396 participants will be randomly assigned to either the intervention group (n=198) or the control group (n=198). Intervention group will watch an online health promotion video tailored to their current stage of change related to SIV uptake once every two weeks for four times (at week 0, 2, 4, and 6). Participants in the control group will watch a same online video providing general advices related to SIV at week 0, 2, 4, and 6. All participants will be followed up by telephone 3 and 6 months after the baseline survey.

Official Title
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A Randomized Controlled Trial Evaluating an Online Intervention Based on the Trans-Theoretical Model in Increasing Seasonal Influenza Vaccination Among Community Dwelling People Aged ≥65 Years

Conditions
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Vaccination Refusal

Intervention / Treatment
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* Behavioral: online health promotion video
* Behavioral: Control (same online health promotion video)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Aged ≥65 years, Having Hong Kong ID Chinese speaking Willing to be followed up by telephone Having a smartphone Have not received seasonal influenza vaccination for the incoming flu season Exclusion Criteria: Cognitive impairment, blindness or deafness, Not able to communicate with others effectively With known contradictions of seasonal influenza vaccination listed by the Centre for Health Protection (allergic to previous SIV, diagnosed/suspected egg allergy, with bleeding disorder or on warfarin)

Ages Eligible for Study
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Minimum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Intervention<br>Participants will watch an online health promotion video tailored to their current stage of change related to SIV uptake once every two weeks for four times (at week 0, 2, 4, and 6) | Behavioral: online health promotion video<br>* Participants will watch an online health promotion video tailored to their current stage of change related to seasonal influenza vaccination uptake once every two weeks for four times (at week 0, 2, 4, and 6)<br>|
| Active Comparator: Control<br>Participants will watch a same online video providing general advices related to SIV at week 0, 2, 4, and 6 | Behavioral: Control (same online health promotion video)<br>* Participants will watch a same online video providing general advices related to seasonal influenza vaccination at week 0, 2, 4, and 6<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Seasonal influenza vaccination uptake | Self-reported uptake of one dose of seasonal influenza vaccination | 6 months |