TL;DR: In this paper, a single case series investigating the possible relationship between stereotyped behaviour and respiratory dysrhythmia was used to identify the most common features of Rett disorder in females.
Abstract: Rett disorder is a developmental disorder affecting 1 in 10 000 females. There is apparently normal development in the first six months after birth, followed by developmental stagnation and regression. Respiratory dysrhythmia and stereotypical behaviour are classic features of the disorder. The study is a single case series investigating the possible relationship between stereotyped behaviour and respiratory dysrhythmia. Results show some modest relationship between these variables in some cases.
TL;DR: Information on age and nature of the onset of autism and other developmental disorders was obtained through review of parent completed developmental history; in addition information on the child’s early development, diagnostic information, and information on parent characteristics was obtained.
Abstract: Information on age and nature of the onset of autism and other developmental disorders was obtained through review of parent completed developmental history; in addition information on the child's early development, diagnostic information, and information on parent characteristics was also obtained. In this relatively large series of cases the parents of children with autism were more likely than parents of children with other developmental disorders to report possible loss of developmental skills. However, the question of actual skill loss was complicated since in some cases parents also had reported even earlier developmental delays or a pattern more of developmental stagnation than clear loss of abilities. Only a few children exhibited a clear and unequivocal loss of developmental skills.