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Journal of Autism and Developmental Disorders, Vol. 33, No. 2, April 2003 (© 2003) Commentary: Blaxill, Baskin, and Spitzer on Croen et al. (2002), The Changing Prevalence of Autism in California 1 2 3,4 Mark F. Blaxill, David S. Baskin, and Walter O. Spitzer INTRODUCTION c They did not consider the trend information within their own dataset Lisa Croen and colleagues (Croen, Grether, c They did not consider obvious ascertainment Hoogstrate, & Selvin, 2002) suggest that the real inci- biases within their youngest autism cohorts dence of autism has not increased. They propose instead c They did not consider similar ascertainment that a pattern of “diagnostic substitution” has moved biases in the mental retardation (MR) category Californian patients who would previously have been c They did not analyze the implications of their diagnosed as mentally retarded (Croen, Grether, & own records review Selvin, 2001) into the autism category. Their calcula- c They did not define a key element of their prin- tions purport to demonstrate that over 100% of the cipal disease frequency measure: prevalence increase in autism from 1987–1994 is an artifact of Correcting the first four of these errors is suffi- changes in diagnostic practices. In your
Journal of Autism and Developmental Disorders – Springer Journals
Published: Oct 5, 2004
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