The authors examined 231 children referred to Gender Identity Clinic at VU University Medical Centre, Amsterdam between April 2004-Oct 2007. They note that estimates of Gender Identity Disorder (GID) ranging from 1in 10,000 to 1 in 50,000 and estimates of Autism Spectrum Disorders being approximately 0.6%. As such, the random co-occurrence of both would be extremely rare.
Their findings showed however that the incidence of ASD was 7.8% in individuals with GID ie 10 times higher than in the general population of 0.6%. They conclude that:
‘This important finding confirms the clinical impression that ASD occurs more frequently in gender Dysphoria individuals than expected by chance’
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