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Table 1 Ability to match primary care provider records to registry records by current age and age at first visit to the primary care site.

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

  Current Registry Users Future-Direct-EMR Users
  Number with registry match/total Percent with registry match P-value* Number with registry match/total Percent with registry match P-value*
Subject age group at time of review       
   0–10 years 152/173 87.9 0.94 201/216 93.1 0.0067
   11–17 years 155/177 87.6   192/226 85.0  
Age at first visit to primary care site       
   0–10 years 274/301 91.0 < 0.0001 343/374 91.7 < 0.001
   11–17 years 25/40 62.5   36/52 69.2  
  1. * Chi-square test statistic