This author, a Professor of Economics and Finance at Baruch College at the City University of New York, examines the association between ASD prevalence and vaccine uptake in each of the 50 U.S. states. Other disabilities such as Speech/Language Impairment (SLI) were also included. She calculated autism and SLI prevalence rates from 2001-2007 by state (using Department of Education data) and vaccine uptake by state (using CDC surveys of vaccine uptake from the National Center for Health Statistics (NCHS)). The author concluded “that if a given U.S. state has a 1% higher vaccination rate than another U.S. state, then the state with the higher vaccination rate might have, on average, a 1.7% higher prevalence of autism or speech disorders.”