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Table 2 Discrepancies in pertussis-related immunization data between 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 Future direct-EMR-transfer sites
  n % with discrepancy Range among provider sites n % with discrepancy Range among provider sites
Discrepancies in pertussis-related immunization series       
   Discrepancy in whether subject is up-to-date for pertussis-related immunizations 288 22.6 12.4–45.7 377 4.0 0–18.6
   Discrepancy in number of pertussis-related immunizations received by subject 288 34.7 19.8–60.1 377 11.9 5.0–30.2
Any present in provider record but not in registry 288 27.8 11.9–60.9 377 0.3 0–1.2
Any present in registry but not in provider record 288 9.7 4.8–17.5 377 0.3 0–1.2
   Discrepancy in date of any pertussis-related immunization in series 288 23.6 13.2–35.0 377 18.0 10.9–36.9
   Discrepancy in formulation of any pertussis-related immunization in series 288 11.1 0–24.4 377 5.3 0–23.3
Discrepancies in pertussis-related immunizations       
   Date discrepancy 1410 10.2 6.1–15.8 1848 8.0 5.5–17.0
Discrepancy of 1–29 days 1410 9.0 4.5–15.3 1848 6.6 3.0–16.5
Discrepancy of 1–11 months 1410 0.9 0–1.5 1848 0.8 0–2.0
Discrepancy of ≥ 1 year 1410 0.4 0–0.5 1848 0.5 0–1.5
   Discrepancy in formulation   34.4 11.8–50.1   29.1 17.6–36.9
Discrepancy in whether pertussis-related immunization contained pertussis vaccine (vs diphtheria-tetanus only) 1410 0.6 0–2.0   0.4 0–1.2
   Discrepancy in manufacturer, among those with manufacturer noted in provider record 468 100 NA 645 94.4 76.2–100
   Discrepancy in lot number, among those with lot number noted in provider record) 539 100 NA 693 95.1 37.5–100