COVID-19 Vaccination Take-Up

NCT04867174 | Completed Results

• 2 other identifiers: 27165P30AG034532
• Study Type: interventional
• Target: 2,701
• Locations: 1 country
• Sites: 1

Brief Summary

In this work, the investigators are partnering with Contra Costa Health Services (CCHS), the department of health in Contra Costa County, CA, to measure COVID-19 vaccinations and other COVID-19 related preventive health behaviors in the county's Medicaid managed care population. This work will test ways to increase COVID-19 vaccine uptake. The investigators hypothesize that small financial incentives and other low-cost behavioral nudges can be used to increase vaccine uptake and reduce disparities in uptake among diverse racial/ethnic minority populations.

Conditions

Covid19; Vaccination

Keywords

COVID19; vaccination

Outcome Measures

Primary Outcomes (1)

• Rate of COVID-19 Vaccination at 1 Month

  Percent of the population with at least one COVID-19 vaccination

  1 month

Other Outcomes (1)

• Vaccine Intentions

  30 days

Study Arms (4)

Control Arm

PLACEBO COMPARATOR

No messaging about COVID-19 vaccination

Behavioral: Financial incentives; Behavioral: Convenient scheduling link

Emotional message

EXPERIMENTAL

Participants view an emotional video from the state of California about getting back to normal.

Behavioral: Financial incentives; Behavioral: Convenient scheduling link

Safety and effectiveness message

EXPERIMENTAL

Participants view a video with information about the safety and effectiveness of the COVID-19 vaccines

Behavioral: Financial incentives; Behavioral: Convenient scheduling link; Behavioral: Race concordant; Behavioral: Gender concordant

Consequences message

EXPERIMENTAL

Participants view a video with information about the consequences of not getting vaccinated against COVID-19.

Behavioral: Financial incentives; Behavioral: Convenient scheduling link; Behavioral: Race concordant; Behavioral: Gender concordant

Interventions

Financial incentives BEHAVIORAL

Each of the study arms, including the no message/control arm, will be interacted with different financial incentives (N=5,000)

Consequences message; Control Arm; Emotional message; Safety and effectiveness message

Convenient scheduling link BEHAVIORAL

In addition, study arms will be randomly assigned a convenient link to the county public vaccine appointment scheduling system highlighted for participants (N=5,000).

Consequences message; Control Arm; Emotional message; Safety and effectiveness message

Race concordant BEHAVIORAL

Randomized to a messenger who is race concordant with the participant

Consequences message; Safety and effectiveness message

Gender concordant BEHAVIORAL

Randomized to a messenger who is gender concordant with the participant

Consequences message; Safety and effectiveness message

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• age 18 and over
• member of Contra Costa Health Plan (CCHP)

You may not qualify if:

• contraindications to vaccination, as determined by county health plan or other medical staff.

Sponsors & Collaborators

• National Bureau of Economic Research, Inc.: lead
• Contra Costa Health Services: collaborator
• Abdul Latif Jameel Poverty Action Lab: collaborator
• University of Southern California: collaborator
• National Institute on Aging (NIA): collaborator

Study Sites (1)

Contra Costa Health Plan

Martinez, California, 94553, United States

Location

MeSH Terms

Conditions

COVID-19

Condition Hierarchy (Ancestors)

Pneumonia, Viral; Pneumonia; Respiratory Tract Infections; Infections; Virus Diseases; Coronavirus Infections; Coronaviridae Infections; Nidovirales Infections; RNA Virus Infections; Lung Diseases; Respiratory Tract Diseases

Limitations and Caveats

Enrollment was lower than initial anticipated.

Results Point of Contact

• Title: Professor Mireille Jacobson
• Organization: University of Southern California

mireillj@usc.edu

(213) 740-5156

Publication Agreements

• PI is Sponsor Employee: No
• Restrictive Agreement: No

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: April 27, 2021
• First Posted: April 30, 2021
• Study Start: May 24, 2021
• Primary Completion: August 15, 2021
• Study Completion: May 24, 2022
• Last Updated: March 28, 2024
• Results First Posted: March 28, 2024

Record last verified: 2024-03

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)