This study aimed to learn about the experiences of families of individuals with a dual diagnosis of Down syndrome (DS) and autism spectrum disorder (ASD) (DS-ASD), and to document the journey from early concerns to diagnosis and intervention. Caregivers completed an online survey describing their journey raising a child with DS-ASD. Survey…

Investigate the association between gastrointestinal (GI) issues and psychometric scores among children with developmental delays and typical development. We examined the association between GI issues and the Mullen Scale of Early Learning (MSEL), Vineland Adaptive Behavior Subscales (VABS), and Aberrant Behavior Checklist (ABC) scores from…

This study describes the profile of repetitive behaviour in individuals with Williams syndrome, utilising cross-syndrome comparisons with people with Prader-Willi and Down syndromes. The Repetitive Behaviour Questionnaire was administered to caregivers of adults with Williams (n = 96), Prader-Willi (n = 103) and Down (n = 78) syndromes. There were…

Social excesses, characterised by heightened social motivation, are important for describing social functioning. Smith-Magenis syndrome (SMS) is a potential exemplar of a disorder where heightened social motivation is associated with negative behavioural outcomes. In Down syndrome (DS) strong social motivation is described, but less commonly…

We examined autism spectrum disorder (ASD) risk in a large national sample of 203 individuals with Down syndrome, 6-25 years old, to determine the association of ASD risk with age, sex, IQ, adaptive behaviors, and maladaptive behaviors. We used a two-pronged approach by (1) considering ASD symptomatology continuously across the sample of…

Syndrome specific repetitive behavior profiles have been described previously. A detailed profile is absent for Rubinstein-Taybi syndrome (RTS). The Repetitive Behaviour Questionnaire and Social Communication Questionnaire were completed for children and adults with RTS (N = 87), Fragile-X (N = 196) and Down (N = 132) syndromes, and individuals…

Mothers of children with Down syndrome, autism, and mixed etiology intellectual disabilities, matched on child age, gender, and communication skills (n = 19 in each group) completed measures of their child's adaptive and problem behaviors, their own parenting stress, and positive perceptions of their child. Children with autism were rated as…

The prevalence, and incidence, of mental ill-health in adults with intellectual disabilities and autism were compared with the whole population with intellectual disabilities, and with controls, matched individually for age, gender, ability-level, and Down syndrome. Although the adults with autism had a higher point prevalence of problem…

Siblings of children with developmental disabilities were assessed twice, 2 years apart (N = 75 at Time 1, N = 56 at Time 2). Behavioral adjustment of the siblings and their brother or sister with developmental disability was assessed. Comparisons of adjustment for siblings of children with autism, Down syndrome, and mixed etiology mental…

This study investigated demographic and phenomenological characteristics of obsessive compulsive disorder (OCD) in nine adults with Down syndrome (DS), and possible effects on adaptive behavior. Results suggest OCD is more common in the DS population than the non-DS population. Ordering and tidiness was the most common form of OCD found, and…

Comparison of behavior problems reported by mothers and teachers of 44 children (ages 6 to 15) with Down syndrome and 44 controls without mental retardation indicated that the Down syndrome children had more behavior problems, in particular attention deficit, noncompliance, thought disorder, and social withdrawal. Life events were associated with…

This study of 39 families with a mentally handicapped adult member found no significant differences in physical care, domestic chores, and supervision for the 20 Down's syndrome and 19 autistic subjects. The brunt of caring fell upon mothers, with fathers helping mainly with supervision. Methods of coping with behavior problems differed between…

This study found that siblings (n=19) of severely autistic children, siblings of children with Down's syndrome, and siblings of normal children did not differ on measures of perceived self-competence or parents' report of social competence. Siblings of autistic children had more internalizing and externalizing behavior problems than siblings of…