COVID-19 Booster Incentives

University of Southern California

Status: Completed

Conditions: Booster Message + Financial Incentive; Booster Message

Treatments: Behavioral: Financial Incentive; Other: Placebo; Behavioral: Messaging

Study type: Interventional

Funder types: Other

Identifiers

NCT05648773

UP-21-01097

Details and patient eligibility

About

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).

Enrollment: 57,893 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

1. Age: 18 and above
2. At least one COVID-19 vaccination (primary series or monovalent booster) but no vaccination dose within the past 2-months.
3. Active phone number or email

Exclusion criteria

1. Opt-out of health system messaging

Trial design

Primary purpose: Health Services Research

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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57,893 participants in 3 patient groups, including a placebo group

Message Only

Experimental group

Description:

Email or SMS Booster Vaccination Reminder

Treatment:

Behavioral: Messaging

Message + Financial Incentive

Experimental group

Description:

Email or SMS Booster Vaccination Reminder + Offer of a financial incentive for getting boosted in the next 2 weeks.

Treatment:

Behavioral: Financial Incentive

Behavioral: Messaging

Control

Placebo Comparator group

Description:

No message or financial incentive

Treatment:

Other: Placebo