Introduction: Individuals with intellectual disabilities (ID) are at heightened risk of behavioral problems. Methods: This study investigated differences in the severity of challenging behaviors (CBs) among individuals with IDs at varying life stages. Data were collected from parents' retrospective interviews. Surveys were completed by 47 parents…

Background: There is strong evidence about the effectiveness of Active Support. Recent research has established predictors of good Active Support as staff training, practice leadership, and service setting size. This paper explores features of organisational leadership and structures predictive of Active Support. Methods: Multilevel modelling with…

The newest edition of the "Diagnostic and Statistical Manual of Mental Disorders" (5th ed., DSM-5) introduced substantial changes to the diagnostic criteria for autism spectrum disorder, including new severity level ratings for social communication and restricted and repetitive behavior domains. The purpose of this study was to evaluate…

Although many researchers have examined the prevalence of stereotypy in individuals with developmental disabilities, the results of previous studies have not been aggregated and analyzed methodically. Thus, we conducted a systematic review of studies reporting the prevalence of stereotypy in individuals with developmental disabilities. Our results…

The association between aberrant behaviour and depression was examined in a sample of 150 young males with Autism Spectrum Disorder via parent ratings on the Aberrant Behavior Checklist (ABC) and the Major Depressive Disorder subscale of the Child and Adolescent Symptom Inventory (CASI-4-D). Although several subscales of the ABC were significantly…

Background: Identification of possible personal indicators of risk for challenging behaviour has generally been through association in cross-sectional prevalence studies, but few analyses have controlled for intercorrelation between potential risk factors. The aim was to investigate the extent to which gender, age, presence of the triad of…

Background: Many people with intellectual disabilities display high levels of anger, and cognitive-behavioural anger management interventions are used routinely. However, for these methods to be used optimally, a better understanding is needed of different forms of anger assessment. The aim of this study was to investigate the relationship of a…

Temperament is important for considering differences among diagnostic groups and for understanding individual differences that predict problematic behavior. Temperament characteristics, such as negative affectivity, effortful control, and surgency (highly active and impulsive), are predictive of externalizing behavior in typically developing…

Teacher ratings on the Aberrant Behavior Checklist were collected on 666 students with mental retardation attending special classes. Classroom placement and age had significant effects on subscale scores, whereas sex failed to affect ratings. The study concludes that the original scoring method, developed for individuals in residential facilities,…