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FIGURE 1—— The effect of income on prevalence of periodontitis in Blacks and Whites: Third National Health and Nutrition Examination Survey, 1988–1994.

Note. Interaction obtained from a model with race/ethnicity as an independent covariates and adjusted for age, gender, education, presence of insurance, time since last dental visit, smoking, and diabetes. Income categories were specified as low (< $20 000) and high ( $20 000).