Incentives for Influenza Vaccination

NCT06300242 | Completed

• 1 other identifier: UP-23-00859
• Study Type: interventional
• Target: 69,972
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

Influenza Vaccination

Outcome Measures

Primary Outcomes (1)

• Vaccination status at 1 week

  influenza vaccination status as documented in the EMR and from the California Immunization Registry (CAIRS)

  1 week

Secondary Outcomes (2)

• Vaccination status at 2 weeks

  2 weeks

• Vaccination status at 1 month

  1 month

Study Arms (3)

Message Only

EXPERIMENTAL

Patients sent an email or SMS reminding them to get vaccinated against the flu.

Behavioral: Reminders

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.

Behavioral: Reminders; Behavioral: Financial Incentive

Active Control

ACTIVE COMPARATOR

Patients not sent any reminder message.

Other: Placebo

Interventions

Reminders BEHAVIORAL

Reminders

Message + Financial Incentive; Message Only

Financial Incentive BEHAVIORAL

$50 financial incentive for getting vaccinated within 1-week

Message + Financial Incentive

Placebo OTHER

No special messages or incentives

Active Control

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Ages 18 and over
• Empaneled patients or non-empaneled patients with a primary care visit in past 18 months with valid insurance
• Due for an annual flu shot according to the electronic medical record
• Active phone number or email
• Do not have "Do not contact" flag

You may not qualify if:

• Under age 18
• Received an annual flu shot based on medical record

Sponsors & Collaborators

• University of Southern California: lead
• J-PAL North America: collaborator

Study Sites (1)

Contra Costa Health Services

Martinez, California, 94553, United States

Location

Related Publications (1)

• 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 Jan 27;75:128263. doi: 10.1016/j.vaccine.2026.128263. Online ahead of print.

  PMID: 41604808 DERIVED

MeSH Terms

Conditions

Influenza, Human

Condition Hierarchy (Ancestors)

Respiratory Tract Infections; Infections; Orthomyxoviridae Infections; RNA Virus Infections; Virus Diseases; Respiratory Tract Diseases

Study Design

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

Study Record Dates

• First Submitted: February 28, 2024
• First Posted: March 8, 2024
• Study Start: January 17, 2024
• Primary Completion: January 24, 2024
• Study Completion: February 29, 2024
• Last Updated: May 13, 2024

Record last verified: 2024-05

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL, SAP, ANALYTIC CODE

Locations

US (1)