Letter only for Health Behaviors

Phase-Based Progress Estimates
Geisinger, Danville, PA
Health Behaviors+3 More
SMS - Behavioral
All Sexes
What conditions do you have?

Study Summary

The purpose of this study is to test which modalities (mailed letter, short message service [SMS] text, or patient portal messages) are most effective for encouraging flu shots in high-risk patients.

Eligible Conditions

  • Health Behaviors
  • Health Promotion
  • Influenza, Vaccination
  • Risk Reduction

Treatment Effectiveness

Study Objectives

1 Primary · 0 Secondary · Reporting Duration: Up to 11 months

Week 4
Flu vaccination
Up to 11 months
ER visits
Flu complications
Up to 8 months
"Likely flu" diagnosis
COVID-19 vaccination rates
High confidence flu diagnosis

Trial Safety

Trial Design

6 Treatment Groups

1 of 6
Letter only
1 of 6
Patient portal only
1 of 6
Letter + Patient portal + SMS
1 of 6
SMS only
1 of 6
Patient portal + SMS
1 of 6
Active Control
Experimental Treatment

43225 Total Participants · 6 Treatment Groups

Primary Treatment: Letter only · No Placebo Group · N/A

Letter only
Experimental Group · 1 Intervention: Letter · Intervention Types: Behavioral
Patient portal only
Experimental Group · 1 Intervention: Patient portal · Intervention Types: Behavioral
Letter + Patient portal + SMSExperimental Group · 3 Interventions: SMS, Letter, Patient portal · Intervention Types: Behavioral, Behavioral, Behavioral
SMS only
Experimental Group · 1 Intervention: SMS · Intervention Types: Behavioral
Patient portal + SMSExperimental Group · 2 Interventions: SMS, Patient portal · Intervention Types: Behavioral, Behavioral
ControlNoIntervention Group · 1 Intervention: Control · Intervention Types:
First Studied
Drug Approval Stage
How many patients have taken this drug

Trial Logistics

Trial Timeline

Approximate Timeline
Screening: ~3 weeks
Treatment: Varies
Reporting: up to 11 months

Trial Background

Prof. Christopher F Chabris, PhD
Principal Investigator
Geisinger Clinic
Closest Location: Geisinger · Danville, PA
2008First Recorded Clinical Trial
5 TrialsResearching Health Behaviors
22 CompletedClinical Trials

Eligibility Criteria

Age 18+ · All Participants · 5 Total Inclusion Criteria

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About The Reviewer

Michael Gill preview

Michael Gill - B. Sc.

First Published: October 9th, 2021

Last Reviewed: August 12th, 2022

Michael Gill holds a Bachelors of Science in Integrated Science and Mathematics from McMaster University. During his degree he devoted considerable time modeling the pharmacodynamics of promising drug candidates. Since then, he has leveraged this knowledge of the investigational new drug ecosystem to help his father navigate clinical trials for multiple myeloma, an experience which prompted him to co-found Power Life Sciences: a company that helps patients access randomized controlled trials.