To the Editor: We read with interest the article by Dr Singer et al1 concerning the cognitive outcomes of preschool children with prenatal exposure to cocaine. The authors make a concerted effort to control for multiple confounding variables, including sex, intelligence of caregivers, and degree of cocaine exposure. They also stress the importance of the environment in which the children are placed as a determinant of their cognitive outcome. However, they do not address lead levels, an important environmental variable known to be strongly associated with both socioeconomic status and development of cognitive ability.2 - 5 We believe that the absence of this information may weaken their conclusions.
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
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