TABLE 1

Immunization Outcomes of Children Included in Spatial Analysis, by Time Period Based on Year Child Turned 36 Months of Age, Kaiser Permanente Northern California

Time Period
2002–20052006–20092010–2012All Years
Number of children42 50761 68450 233154 424
Immunization outcomes
 Underimmunized, n (%)3456 (8.1)5689 (9.2)6206 (12.4)15 351 (9.9)
 Shot-limiters, n (%)298 (0.7)647 (1.0)1176 (2.3)2121 (1.4)
 At least 1 vaccine refusal diagnosis, n (%)a1752 (3.5)
  • a Use of refusal diagnosis codes in this health plan was rare before 2007 and so are reported here only for the 2010–2012 time period.