Age-Specific Strategies for Immunization Reminders and Recalls

Study Overview
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Brief Summary
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The objective of this study was to assess the relative effectiveness of reminder/recall strategies among children who live in an urban area targeting alternative age-specific milestones.

Conditions
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Childhood Vaccination

Intervention / Treatment
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* Behavioral: Childhood vaccination reminder / recall notification


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 7 and 19 month recall groups: children not up to date for at least one vaccination at the time of notification 12 month reminder group: 12 months of age at time of notification Hib vaccination series was not assessed due to a vaccine shortage Exclusion Criteria: Children were ineligible for notifications if they were designated in the Michigan Care Improvement Registry (MCIR)as having died, documented previously as having moved out of the jurisdiction (Moved or Gone Elsewhere (MOGE)), opted out of MCIR by their parent, or if they had been previously mailed for MCIR reminder/recall activity in the prior 60 days.

Ages Eligible for Study
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Minimum Age: 7 Months
Maximum Age: 19 Months

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| No Intervention: No reminder / recall notice<br>No childhood vaccination reminder / recall notification sent. Stratified by age cohort of subjects: 7 month recall; 12 month reminder; 19 month recall | |
| Experimental: mailed reminder / recall notice<br>Childhood vaccination reminder / recall notification sent by postal mail. Stratified by age cohort of subjects: 7 month recall; 12 month reminder; 19 month recall | Behavioral: Childhood vaccination reminder / recall notification<br> <br> * Other names: Reminder / recall notifications sent by postal mail;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| new immunization doses | Receipt of 1 or more childhood vaccinations with administration date following reminder notification date | within 60 days of reminder notification | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Cost of vaccination reminder | Estimated personnel costs to generate reminder notifications, print, fold / stuff envelopes and follow up on undeliverable notifications | During the time of reminder notification preparation and mailing and approximately 1 month following mailing | 
| historical immunization doses | One or more vaccination recorded with the date of administration prior to the reminder notification date | within 60 days of reminder notification | 
| waived doses | One or more immunization waiver (non-administration) recorded with the date following the date of reminder notification | within 60 days of reminder notification | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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immunization, vaccination, immunization information system, immunization registry, reminder / recall