COVID-19 Booster Incentives in a County-Run Health System
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Enrollment
- 57,893
- Locations
- 1
- Primary Endpoint
- Vaccine booster
Study Overview
Brief Summary
The goal of this work is to understand whether small financial incentives and messaging can increase the take-up of COVID-19 boosters among patients empaneled at a county public health system. The motivation for this work is the relatively low take-up of COVID-19 boosters. In California, where our experiment is based, only 59% of the population has been boosted, with only 13% receiving the recommended bivalent booster (State of California, 2022).
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Health Services Research
- Masking
- Single (Participant)
Eligibility Criteria
- Ages
- 18 Years to — (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •Age: 18 and above
- •At least one COVID-19 vaccination (primary series or monovalent booster) but no vaccination dose within the past 2-months.
- •Active phone number or email
Exclusion Criteria
- •Opt-out of health system messaging
Arms & Interventions
Message Only
Email or SMS Booster Vaccination Reminder
Intervention: Messaging (Behavioral)
Message + Financial Incentive
Email or SMS Booster Vaccination Reminder + Offer of a financial incentive for getting boosted in the next 2 weeks.
Intervention: Messaging (Behavioral)
Message + Financial Incentive
Email or SMS Booster Vaccination Reminder + Offer of a financial incentive for getting boosted in the next 2 weeks.
Intervention: Financial Incentive (Behavioral)
Control
No message or financial incentive
Intervention: Placebo (Other)
Outcomes
Primary Outcomes
Vaccine booster
Time Frame: 2 weeks
Received a booster vaccination within 2-weeks of message.
Secondary Outcomes
No secondary outcomes reported
Investigators
Mireille Jacobson
Associate Professor
University of Southern California