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In 2008, only 20 states had a universal helmet policy, an effective safety measure for reducing motorcycle fatalities and serious injuries. <\/jats:p><jats:p> We used state-specific longitudinal data for the continental United States from 1990 through 2005 to determine which industry, political, economic, and demographic factors had a significant influence on the enactment of universal helmet policies. Our findings suggest that political climate and ideology are important predictors of helmet policies. <\/jats:p>","DOI":"10.2105\/ajph.2008.134106","type":"journal-article","created":{"date-parts":[[2008,12,24]],"date-time":"2008-12-24T02:58:32Z","timestamp":1230087512000},"page":"415-423","source":"Crossref","is-referenced-by-count":23,"title":["Motorcycle Helmet Laws in the United States From 1990 to 2005: Politics and Public Health"],"prefix":"10.2105","volume":"99","author":[{"given":"Jenny","family":"Homer","sequence":"first","affiliation":[{"name":"Jenny Homer is with the Sociology Research Center, University of Miami, Coral Gables, FL. Michael French is with the Department of Sociology and the Sociology Research Center, University of Miami, Coral Gables."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"French","sequence":"additional","affiliation":[{"name":"Jenny Homer is with the Sociology Research Center, University of Miami, Coral Gables, FL. Michael French is with the Department of Sociology and the Sociology Research Center, University of Miami, Coral Gables."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"844","reference":[{"key":"bib1","unstructured":"Traffic Safety Facts 2005. Washington, DC: National Highway Traffic Safety Administration, National Center for Statistics and Analysis; 2005. 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