Questionnaires documenting self-injurious behavior (SIB) among 113 elementary students were returned by 21 London schools. Cluster analysis found patterns of behavior associated with each other, indicating that SIB may not be a homogeneous condition but may comprise a number of distinct syndromes depending on sex, age, mobility, communication…

This study performed a factor analysis of the Developmental Behavior Checklist (DBC) with 531 children and adolescents with mental retardation. The DBC is intended to assess psychopathology in youth with mental retardation. Findings indicated substantial overlap with the factor analyses of the scale's developers and high levels of internal…

The Reiss Screen for Maladaptive Behavior was factor analyzed in 2 institutional samples and 1 community sample of persons with mental retardation (total n=353). Factor analysis revealed no strong justification for the instrument's seven scales. An alternative three-factor solution, comprising intrapersonal maladaptive behavior, psychotic…

This study organizes items from seven behavior rating instruments into as few behavior clusters as possible. Methods used include card sort activities and a panel of experts examining items to establish their subgroup placement. Findings indicate a method for organizing behavior descriptors into clearly defined subgroupings and unifying behavior…

Analysis of data from the Behaviour Disorder Scale for 405 adults and adolescents with intellectual disability revealed that subjects exhibited a mean of 14 problem behaviors per person. Factor analysis identified two general syndromes (a conduct syndrome and an emotional syndrome), raising the possibility of dealing with sets of problem behaviors…