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Despite considerable interest in the genetic, physical and neurological aspects of Rett syndrome (RS), there have been few studies of associated behavioural and emotional features. Furthermore, few case studiesor surveys have included adult women with RS. The main aim of the present study was to compare behaviour problems in a sample of women with RS against data from normative samples.The primary carers of 50 women with RS completed the community version of the Aberrant Behavior Checklist.Women with RS were rated as having lower levels of irritability, hyperactivity and inappropriate speech behaviours than normative samples of adults with intellectual disability.A number of factors may affect the presentation of behaviour problems in women with RS (e.g. cognitive impairments or physical disabilities). Therefore, more research is needed in order to generate information about the behavioural phenotype of RS. The implications of the present data for future research are also discussed.