“…Economic and demographic measures of socioeconomic status, particularly parental education, income, family size, and race, have consistently been shown to influence receipt of immunization (4, 14,18,26,27,29,43,44,46,48,50,52,58,62). A national telephone survey of access to health care, conducted in 1986 by the Robert Wood Johnson Foundation, found that children who were uninsured, poor, or nonwhite were less likely to have seen a physician in the past year, and uninsured children under age 5 were less likely to have up-to-date immunizations.…”