Data for this study are from the Detroit DentalHealth Project (DDHP), one of five Centers fundedby the National Institute of Dental and CraniofacialResearch (NIDCR grant U-54 DE 14261) to conductresearch on reducing oral health disparities (27).The DDHP focuses on understanding the social,familial, biological, and neighborhood context oforal health in a large, population-based sample oflow-income African-American families in Detroit,Michigan. The sample was selected using a multistagearea probability sample design. The DDHPresearch team selected the 39 Census tracts with thelowest median household income in the city ofDetroit based on 2000 Census data. Families wereeligible if they had at least one child <6 years of ageat baseline and were below 250% of federal povertyline. Of the 12 265 randomly selected housingunits, 9781 were successfully contacted and anadult living in the unit responded to the projectstaff (77.3% contact rate). Of the 9781 contactedhousing units, 1386 (14.2%) had an eligible African-American child <6 years of age. Of the 1386families with eligible children, 1021 completed thestudy (73.7%).
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