Brief Report: Asperger’s Syndrome and Sibling Birth Order
Prior investigations suggest that birth order position may be associated with the risk for developing a pervasive developmental disorder. This retrospective chart review examined the birth order status of 29 psychiatrically-referred patients with Asperger’s Syndrome (AS). Eighty-six percent of the subjects were first born. The finding was statistically significant when compared to an expected random distribution of AS subjects χ2 (1, N = 29) = 9.18, p < 0.01. The reasons for such an association are unclear though birth stoppage, obstetric complications, and immunological mechanisms may play a role.
KeywordsAsperger’s syndrome Pervasive developmental disorders Birth order Epidemiology
Conflict of interest
This project was funded under partial support from the Casa Colina Foundation.
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