NCT05648773

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).

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
57,893

participants targeted

Target at P75+ for not_applicable

Timeline
Completed

Started Dec 2022

Shorter than P25 for not_applicable

Geographic Reach
1 country

1 active site

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

December 8, 2022

Completed
Same day until next milestone

Study Start

First participant enrolled

December 8, 2022

Completed
5 days until next milestone

First Posted

Study publicly available on registry

December 13, 2022

Completed
10 days until next milestone

Primary Completion

Last participant's last visit for primary outcome

December 23, 2022

Completed
Same day until next milestone

Study Completion

Last participant's last visit for all outcomes

December 23, 2022

Completed
Last Updated

August 14, 2023

Status Verified

August 1, 2023

Enrollment Period

15 days

First QC Date

December 8, 2022

Last Update Submit

August 9, 2023

Conditions

Booster MessageBooster Message + Financial Incentive

Outcome Measures

Primary Outcomes (1)

  • Vaccine booster

    Received a booster vaccination within 2-weeks of message.

    2 weeks

Study Arms (3)

Message Only

EXPERIMENTAL

Email or SMS Booster Vaccination Reminder

Behavioral: Messaging

Message + Financial Incentive

EXPERIMENTAL

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

Behavioral: MessagingBehavioral: Financial Incentive

Control

PLACEBO COMPARATOR

No message or financial incentive

Other: Placebo

Interventions

MessagingBEHAVIORAL

Booster reminder message

Message + Financial IncentiveMessage Only
Financial IncentiveBEHAVIORAL

Financial Incentive for getting boosted within 2-weeks of the message

Message + Financial Incentive
PlaceboOTHER

Treatment as usual; no additional message and no incentive.

Control

Eligibility Criteria

Age18 Years+
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • 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

You may not qualify if:

  • \. Opt-out of health system messaging

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Contra Costa Health Plan

Martinez, California, 94553, United States

Location

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
SINGLE
Who Masked
PARTICIPANT
Purpose
HEALTH SERVICES RESEARCH
Intervention Model
PARALLEL
Sponsor Type
OTHER
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
Associate Professor

Study Record Dates

First Submitted

December 8, 2022

First Posted

December 13, 2022

Study Start

December 8, 2022

Primary Completion

December 23, 2022

Study Completion

December 23, 2022

Last Updated

August 14, 2023

Record last verified: 2023-08

Data Sharing

IPD Sharing
Will share
Shared Documents
STUDY PROTOCOL, SAP, ANALYTIC CODE
Access Criteria
Researchers can request de-identified data from Contra Costa Health Services.

Locations

US(1)