Children ages 0-3 years are at greatest risk for lead exposure due to their rapidly developing bodies; frequent hand-to-mouth behavior; potentially inadequate nutritional status; and parental lack of knowledge of lead hazard prevention and control. Of Detroit's 30,307 children one and two years of age, 14,604 (48%) were tested in 2003. Of the 14,604 tested, 1,053 (7.2%) had blood lead levels greater than or equal to 10ėg/dL, and 1.4% (203) had elevated lead levels greater than or equal to 20ėg/dL.