Table 3.

Proportion Covered by MMR1 and MMR2 Vaccine Doses Under Different Imputation Scenarios and by School Type, Kindergarteners With Personal Beliefs Exemptions, California Department of Public Health Kindergarten Retrospective Survey and Selective Review, 2009.

	MMR1 Coverage [95% CI]		MMR2 Coverage [95% CI]
	Random sample	High-PBE schools	Random sample	High-PBE schools
All exempted kindergarteners at sampled schools (N=1,362)
As reported in KRS09	0.473 [0.413–0.534]	0.339 [0.311–0.367]	0.184 [0.138–0.232]	0.107 [0.089–0.125]
Imputationa + Minimum Coverage	0.643 [0.599–0.683]	0.485 [0.463–0.507]	0.251 [0.202–0.306]	0.160 [0.141–0.180]
Imputation + Median Coverage	0.909 [0.870–0.942]	0.860 [0.841–0.880]	0.490 [0.439–0.546]	0.217 [0.194–0.241]
Imputation + Maximum Coverage	0.921 [0.885–0.950]	0.900 [0.884–0.916]	0.581 [0.527–0.637]	0.629 [0.606–0.651]
All kindergarteners at sampled schools (N=11,210)
As reported in KRS09	0.990 [0.990–0.991]	0.799 [0.786–0.812]	0.985 [0.984–0.985]	0.729 [0.714–0.743]
Imputation + Minimum Coverage	0.994 [0.986–0.990]	0.843 [0.836–0.849]	0.985 [0.983–0.987]	0.745 [0.740–0.751]
Imputation + Median Coverage	0.998 [0.997–0.999]	0.957 [0.951–0.962]	0.990 [0.989–0.991]	0.762 [0.755–0.770]
Imputation + Maximum Coverage	0.998 [0.997–0.999]	0.969 [0.964–0.974]	0.992 [0.991–0.993]	0.888 [0.881–0.894]

MMR1 first dose of measles, mumps, rubella vaccine; MMR2 second dose of measles, mumps, rubella vaccine; KRS09 2009 California Department of Public Health Kindergarten Retrospective Survey.

^aImputations were conducted with the missForest procedure under scenarios of minimum coverage, median coverage, and maximum coverage where exempted children are as vaccinated for MMR1 and MMR2 as the least, average, and most vaccinated child at their school respectively.