Behavioral Economics to Improve Flu Vaccination Using EHR Nudges Replication

Many older adults are at risk of illness, hospitalization, and death from vaccine-preventable diseases. More than half of older adults in the United States are not vaccinated for flu which has remained relatively constant over the past decade, and there are racial, ethnic, and socioeconomic disparities in care. In this study, we will evaluate personalized nudges to clinicians and patients to help increase flu vaccination rates during primary care visits among older adults at three distinct health systems, with a particular focus on population subgroups at high risk for vaccine noncompletion. In a partnership between Penn Medicine and University of Washington (UW) Medicine, a 6-month, multisite, cluster randomized, pragmatic trial with an additional intensification arm for high-risk patients was conducted from September 2023-February 2024. We will now conduct a 6-month replication trial at Lancaster General Health for the 2024-2025 flu season.

Inclusion criteria

All patients must meet the following criteria to be eligible:

• Age ≥ 50 years
• A scheduled new or return (non-urgent/sick) primary care appointment at one of the study practices at Lancaster General Health
• Have not received their annual flu vaccine during the active intervention period (September- February)
• Eligible to receive the flu vaccine

For the patient intensification nudge, at least one of the following criteria must be met to be considered high risk and randomized to receive the intensification nudge:

• Age ≥ 70 years
• Living in a lower income community (lowest quartile, zip-code based)
• Did not receive a flu vaccine in the previous calendar year
• Self-identifies as Non-Hispanic Black

Clinicians must meet the following criteria to be eligible to receive peer comparison feedback:

• Practicing physician (MD, DO) or advanced practice provider (NP, PA) with the exception of residents and fellows
• Have a minimum patient panel of at least 50 patients, and
• Practicing at a clinical site randomized to receive the clinic-level nudge interventions.

Exclusion criteria

Patients will be excluded from the study if they:

• Have a documented allergy to flu vaccine
• Have a flu vaccine exclusion modifier in Health Maintenance
• Have opted out of research according to individual site guidelines and policies
• Have no phone number (home or mobile) listed in their chart