Monday, March 17, 2008 - 4:05 PM

Evaluation of Intervention to Improve Immunization Up-to-Date Rates Among Children Attending WIC in South Los Angeles: Do Reminders Make a Difference?

Jennifer L. Chiprich, Terry Silberman, Julia Heinzerling, and Lizz Romo. LA BioMed/ South LA Health Projects, South LA Health Projects, 2930 W Imperial Hwy, Suite 601, Inglewood, CA, USA

Learning Objectives for this Presentation:
By the end of the presentation, participants will be able to:
1) describe an intervention designed to improve up-to-date (UTD) rates among children receiving services through WIC centers in South Los Angeles; and
2) describe the evaluation design and results.

: Ongoing interventions to improve childhood up-to-date rates at LA BioMed WIC sites in South Los Angeles include immunization screening and referral and a voucher incentive program. Funding from the California State Immunization Branch and the CDC REACH 2010 Initiative supported a supplemental intervention designed to identify children who were falling behind on the primary series of immunizations, and provide reminders by telephone and/or letter.

To evaluate the use of reminders from Community Health Outreach Workers (letters and telephone call) to improve pediatric immunization UTD rates.

Between Jan and Dec 2006, 1250 children were randomly assigned to a control or intervention group. Participants were either 3 or 5 months of age and behind on at least one immunization. Both groups received the WIC-based interventions. The intervention group also received follow-up telephone calls and letters. Immunization rates were monitored through an electronic tracking system. Proportions up-to-date (3:2:2:2 series) and receipt of individual antigens were calculated at 7 months and 13 months for both groups. Chi-square analysis measured association between participation in the intervention and up-to-date status.

There was no significant difference in the overall UTD rate between groups at 7 or 13 months of age. Change in UTD rates between 7 and 13 months was not significantly associated with receipt of the intervention and there was no difference in rates for those receiving only a letter or only a telephone call.

Supplemental reminder calls and/or letters in addition to ongoing WIC-based interventions did not significantly improve UTD rates in this urban population.