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Table 4 Discrepancies for 11–17-year-olds in MMR, hepatitis B, and varicella immunization data in provider records and the immunization registry.

From: Implications for registry-based vaccine effectiveness studies from an evaluation of an immunization registry: A cross-sectional study

  Current registry user sites
N = 6 sites, 143 matched records
Future direct-EMR-transfer sites
N = 7 sites, 180 matched records
  % with
discrepancy
Range among provider sites % with
discrepancy
Range among provider sites
MMR     
   Discrepancy in whether subject is up-to-date for MMR immunization 19.6 9.5–43.5 14.4 5.3–36.4
   Discrepancy in number of MMR immunizations received by subject 18.2 9.5–43.5 11.1 0–31.8
   Discrepancy in date of any MMR immunization in series 22.4 5.3–33.3 16.1 7.5–38.1
Hepatitis B     
   Discrepancy in whether subject is up-to-date for hepatitis B immunization 29.4 9.5–82.6 13.9 5.3–31.8
   Discrepancy in number of hepatitis B immunizations received by subject 27.3 10.0–78.3 12.8 4.8–22.7
   Discrepancy in date of any hepatitis B immunization in series 16.8 10.5–23.8 16.1 5.3–29.4
Varicella     
   Discrepancy in whether subject is up-to-date for varicella immunization 69.2 23.8–100 63.9 57.5–82.4
   Discrepancy in number of varicella immunizations received by subject* 30.4 20.0–80.0 7.6 0–20.0
   Discrepancy in date of any varicella immunization in series* 3.6 0–10.0 2.9 0–20.0
  1. *Excludes provider records with documentation of varicella disease.