IJE Advance Access originally published online on September 7, 2009
International Journal of Epidemiology 2009 38(5):1238-1239; doi:10.1093/ije/dyp257
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Published by Oxford University Press on behalf of the International Epidemiological Association © The Author 2009; all rights reserved.
Commentary: Fact and artefact in the secular increase in the rate of autism
MRC SGDP Centre, PO 80, Institute of Psychiatry, King's College London, De Crespigny Park, Denmark Hill, London SE5 8AF, UK. E-mail: camilla.azis@kcl.ac.uk
Accepted 23 September 2008
| The first 10% of the full text of this article appears below. |
King and Bearman1 sought to determine whether the increased prevalence of an autism diagnosis in California was due to diagnostic substitution of autism in place of mental retardation (MR). They make good use of systematic administrative data from the California Department of Developmental Services between 1992 and 2005 for this purpose, with the conclusion that changes in diagnostic practices accounted for a quarter of the observed increase in diagnosed autism over
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