Assessing equivalence: an alternative to the use of difference tests for measuring disparities in vaccination coverage.

Vaccination coverage surveys - Publication abstract: Eliminating health disparities in vaccination coverage among various groups is a cornerstone of public health policy. However, the statistical tests traditionally used cannot prove that a state of no difference between groups exists. Instead of asking, \"Has a disparity--or difference--in immunization coverage among population groups been eliminated ?,\" one can ask, \"Has practical equivalence been achieved?\" A method called equivalence testing can show that the difference between groups is smaller than a tolerably small amount. This paper demonstrates the method and introduces public health considerations that have an impact on defining tolerable levels of difference. Using data from the 2000 National Immunization Survey, the authors tested for statistically significant differences in rates of vaccination coverage between Whites and members of other racial/ethnic groups and for equivalencies among Whites and these same groups. For some minority groups an