Education and income-based inequality in tooth loss among Brazilian adults: does the place you live make a difference?
Abstract Background: Socioeconomic inequalities in tooth loss might be minimized or potentialized by the characteristics of the context where people live. We examined whether there is contextual variation in socioeconomic inequalities in tooth loss across Brazilian municipalities. Methods: Data from the 2010 National Oral Health Survey of 9,979 adults living in 177 Brazilian municipalities were used. Education and household income were used as the individual socioeconomic indicators. At the municipal level, we used the Municipal Human Development Index as our contextual indicator of socioeconomic status (low:<0.699 versus high: >0.70). The Relative Index of Inequality (RII) and the Slope Index of Inequality (SII) were calculated to compare the magnitude of education and income-based inequalities among municipalities with low versus high HDI. Multilevel Poisson regression models with random intercepts and slopes were developed. Results: At the individual level, adults with lower education & income reported more tooth loss. The mean number of lost teeth was 9.62 (95%CI: 8.02-11.23) and 7.03 (95%CI: 6.52-7.55) in municipalities with low and high HDI, respectively. Municipalities with high HDI showed higher relative and absolute education-based inequality. For income-based inequalities, higher SII was observed in municipalities with lower HDI. A significant cross-level interaction indicated that high-education adults reported fewer lost teeth when they lived in municipalities with high HDI compared to adults with the same education level living in low HDI municipalities. For individuals with the lowest education level, there was no difference in the number of teeth between those from municipalities with high and low HDI. Conclusions: There was a social gradient in tooth loss by education and income. Living in disadvantaged municipalities cannot overcome the risk associated with low schooling. The protective effect of higher education can be reduced when people live in disadvantaged areas.