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Table 1 The reduced KVB dataset compared to the respective Bavarian birth cohorts and causes for the observed differences.

From: Vaccination coverage in children can be estimated from health insurance data

  percent N
Bavarian birth cohorts (1.10.2001–31.12.2002) [9] 100 142,809
Reduced KVB dataset 78 111,977
difference   30,832
Reasons:   
   privately insured+ 10.0 14,281
   change of insurance* 5.0–8.0 7,140–11,425
   no consultancy of outpatient physician in 1st 6 months and 2nd year of life* 4.9 6,998
   moving from Bavaria [9] 1.4 1,999
  1. * estimated from AOK Bavaria data (own data)
  2. + personal communication of Dr. Frank Niehaus, WIP-PKV (scientific Institute of the Private Health Insurances)