"A Multiple-Source Method for Studying the Prevalence of Developmental Disabilities in Children: The Metropolitan Atlanta Developmental Disabilities Study" by Yeargin-Allsopp et al appeared in the April issue of Pediatrics (1992;89:624-630). Some of the information presented in this article has been revised using updated population estimates of the metropolitan Atlanta area. In the abstract on page 624, the statistics in the sentence, "The prevalence rates found in this study, per 1000 10-year-old children, were as follows: mental retardation, 10.3; cerebral palsy, 2.0; hearing impairment, 1.0; and visual impairment, 0.6," should be changed to "mental retardation, 12.0; cerebral palsy, 2.3; hearing impairment, 1.1; and visual impairment, 0.7." On page 625, in the first paragraph under "Study Population," the text beginning "From September 1985 to August 1988,..." shold read "From September 1985 to August 1988, the years in which we identified children with DDs, there were approximately 30 000 10-year-old children in the five-county study area each year. Sixty-three percent of these children were white and 37% were races other than white; 52% of these children were male and 48% were female. The population data used for determining prevalence rates were estimated from Georgia population estimates (1985 through 1987)." On page 627, under "Results," "1441 DDs" should be changed to "1439 DDs." On Table 3, page 627, the number of children with cerebral palsy should be changed to 204. The prevalence rates on Table 3 should be changed to: mental retardation, 12.0; cerebral palsy, 2.3; visual impairment, 0.7; hearing impairment, 1.1.