1 UNITED STATES AND EUROPEAN SCHOOL-AGED DISABILITY PREVALENCE: AN INVESTIGATIVE STUDY TO ELABORATE DIFFERENCES A Report Prepared for the Organization for Economic Co-operation and Development Barbara W. LeRoy, Ph.D. (Consultant) Developmental Disabilities Institute Wayne State University Detroit, Michigan USA Peter Evans, Ph.D., FBPsS OECD/OCDE Marcella Deluca, MSc OECD/OCDE Through funding from Office of Special Education Programs U.S. Department of Education December 2000