Chalanda Smith
National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention
An Evaluation of the Impact of Using an Alternate Caller ID Display in the National Immunization Survey
Megha Ravanam
NORC at the University of Chicago
Benjamin Skalland
NORC at the University of Chicago, Chicago, IL
Zhen Zhao
National Center for Immunization and Respiratory Diseases
David Yankey
National Center for Immunization and Respiratory Diseases
Chalanda Smith
National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention
The National Immunization Surveys (NIS) include dual frame RDD telephone surveys used to monitor vaccination coverage in the U.S. among children age 19-35 months and adolescents age 13-17 years, and to assess influenza vaccination for children age 6 months-17 years. The surveys collect household-reported data during telephone interviews with the child's parent/guardian. The parent/guardian is then asked for consent to contact the child's provider(s) to obtain an immunization history. The success of the NIS relies on a respondent answering the phone, and the caller ID is the earliest opportunity to convey information about the caller's identity. An evaluation was conducted to determine the impact on contact rates of using an alternate caller ID display. The caller ID for the NIS surveys previously displayed "NORC UCHICAGO", identifying the contractor. It was hypothesized that having the caller ID display the name CDC instead of NORC would increase contact rates. Half of the sample was randomly flagged to display the "NORC UCHICAGO," and the rest would display "CDC NATL IMMUN." Study design, results, conclusions, limitations, and recommendations for future research are presented.