caa a22 4500 463250257 CHVBK 20180405153338.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10803-006-0326-4 doi (NATIONALLICENCE)springer-10.1007/s10803-006-0326-4 Trends in Special Education Code Assignment for Autism: Implications for Prevalence Estimates [Elektronische Daten] [Hélène Ouellette-Kuntz, Helen Coo, Jennifer Lloyd, Liza Kasmara, Jeanette Holden, M. Lewis] There is considerable controversy over reasons for observed increases in the prevalence of autism spectrum disorders. We examined trends in British Columbia education database coding of children with autism from 1996 to 2004. There was a significant linear increase in autism prevalence. The proportion of children identified by age 6 increased significantly from 1996 to 1999. When we calculated prevalence assuming onset prior to age 3, previously unidentified cases, particularly among girls in 1996 and 1997, accounted for substantial increases in estimated prevalence. The magnitude of under-identification decreased from 1996 to 2000, and rose slightly in 2001. Analyses of prevalence trends must take into account effects of earlier age at identification and inclusion of previously undetected cases on prevalence estimates. Springer Science+Business Media, LLC, 2006 Autism nationallicence autistic disorder nationallicence prevalence nationallicence trends nationallicence special education nationallicence Edudata Canada nationallicence British Columbia Ministry of Education nationallicence Ouellette-Kuntz Hélène Queen's University, c/o Ongwanada Resource Centre, 191 Portsmouth Avenue, K7M 8A6, Kingston, Ontario, Canada aut Coo Helen Queen's University, Kingston, Ontario, Canada aut Lloyd Jennifer University of British Columbia, Vancouver, BC, Canada aut Kasmara Liza University of British Columbia, Vancouver, BC, Canada aut Holden Jeanette Queen's University, Kingston, Ontario, Canada aut Lewis M. University of British Columbia, Vancouver, BC, Canada aut Journal of Autism and Developmental Disorders Springer US; http://www.springer-ny.com 37/10(2007-11-01), 1941-1948 0162-3257 37:10<1941 2007 37 10803 https://doi.org/10.1007/s10803-006-0326-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10803-006-0326-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ouellette-Kuntz Hélène Queen's University, c/o Ongwanada Resource Centre, 191 Portsmouth Avenue, K7M 8A6, Kingston, Ontario, Canada aut NATIONALLICENCE 700 1- Coo Helen Queen's University, Kingston, Ontario, Canada aut NATIONALLICENCE 700 1- Lloyd Jennifer University of British Columbia, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Kasmara Liza University of British Columbia, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Holden Jeanette Queen's University, Kingston, Ontario, Canada aut NATIONALLICENCE 700 1- Lewis M. University of British Columbia, Vancouver, BC, Canada aut NATIONALLICENCE 773 0- Journal of Autism and Developmental Disorders Springer US; http://www.springer-ny.com 37/10(2007-11-01), 1941-1948 0162-3257 37:10<1941 2007 37 10803 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer