This paper includes a nontechnical description of methods for calculating effect sizes in intellectual and developmental disability studies. Different hypothetical studies are used to illustrate how null hypothesis significance testing (NHST) and effect size findings can result in quite different outcomes and therefore conflicting results. Whereas…

Clinicians need to know the likelihood of a condition given a positive or negative diagnostic test. In this study a Bayesian analysis of the Clinical Behavior Checklist for Persons with Intellectual Disabilities (CBCPID) to predict depression in people with intellectual disability was conducted. The CBCPID was administered to 92 adults with…

Existing estimates of the prevalence of intellectual disability vary substantially between different studies and among different populations (AIHW: Wen, 1997; Roeleveld, Zielhuis, & Gabreels, 1997; Leonard & Wen, 2002), often affected by differences in operational definitions and methods of estimation. For example, in Australia, operational…

This paper proposes a model whereby children's behavior problems, parental stress, and parenting behavior are related. It reports evidence that child behavior problems lead to parental stress but finds other model aspects have not been tested in the developmental disability field. Also considered are practical implications integrating research of…

Boys with (n=16) and without (n=18) intellectual disability (ID) performed the Wingate Anaerobic Test (WAnT) on two separate occasions. Comparable levels of reliability and agreement were found on the WAnT for both groups. However, the performances of boys with ID were more variable, less powerful, and resulted in lower post-exercise blood lactose…

Results of this longitudinal study (7 years) suggested that the stress attributed to a specific child (including a child with an intellectual disability) by parents (N=93) may be an indicator of more general family stress. Although the strength of parental worry decreased, the pattern of worries did not change over time. (Contains references.)…

This study assessed antecedents of severe problem behaviors of 92 adults with intellectual disability using a checklist comprising 19 scales of antecedent events scored for likelihood of preceding problem behaviors. Data analysis with clients with conduct behavior problems, emotional behavior problems, and both conduct and emotional behavior…

Fifty-five mothers of young children with Down syndrome completed the Parenting Stress Index. Low internal reliability coefficient for the Adaptability/Plasticity Child Domain subscale was found. Factor analysis of the scale found that the Adaptability/Plasticity factor did not perform as a unidimensional structure, but provided information on…