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| Name | Class |
|---|---|
| J-PAL North America | UNKNOWN |
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In this work, we are assessing the impact of messaging with or without a $50 financial incentive on influenza vaccination rates in a county health system. Our main hypothesis is that a message with a $50 financial incentive will increase vaccination rates relative to a control/"treatment as usual" group. We further hypothesize that the financial incentive will increase vaccination rates relative to the message only arm.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Message Only | Experimental | Patients sent an email or SMS reminding them to get vaccinated against the flu. |
|
| Message + Financial Incentive | Experimental | Patients sent an email or SMS reminding them to get vaccinated against the flu and offering them a $50 financial incentive if they are vaccinated within 1-week. |
|
| Active Control | Active Comparator | Patients not sent any reminder message. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Reminders | Behavioral | Reminders |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Vaccination status at 1 week | influenza vaccination status as documented in the EMR and from the California Immunization Registry (CAIRS) | 1 week |
| Measure | Description | Time Frame |
|---|---|---|
| Vaccination status at 2 weeks | Influenza vaccination status as documented in the EMR and from the California Immunization Registry (CAIRS) | 2 weeks |
| Vaccination status at 1 month | Influenza vaccination status as documented in the EMR and from the California Immunization Registry (CAIRS) |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Contra Costa Health Services | Martinez | California | 94553 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 41604808 | Derived | Chang TY, Jacobson M, Shah M, Pramanik R, Shah SB. Impact of reminder messages, with and without financial incentives, on influenza vaccination: A randomized trial in a California health system. Vaccine. 2026 Mar 7;75:128263. doi: 10.1016/j.vaccine.2026.128263. Epub 2026 Jan 27. |
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Will be shared with qualified researchers upon request.
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| ID | Term |
|---|---|
| D007251 | Influenza, Human |
| ID | Term |
|---|---|
| D012141 | Respiratory Tract Infections |
| D007239 | Infections |
| D009976 | Orthomyxoviridae Infections |
| D012327 | RNA Virus Infections |
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| Financial Incentive |
| Behavioral |
$50 financial incentive for getting vaccinated within 1-week |
|
| Placebo | Other | No special messages or incentives |
|
| 1 month |
| D014777 | Virus Diseases |
| D012140 | Respiratory Tract Diseases |