Psychotic behavior in children under the institutions for mentally retarded in Denmark.

The purpose of this research project was to identify children with psychotic behavior in the Institutions for the Mentally Retarded in Denmark and to analyze psychotic behavior. The subjects for study were 392 children, partly selected as a representative sample, partly selected as a sample of children with psychotic behavior. A combined observation and interview scheme was constructed containing 17 behavioral items and 6 developmental scales. Scoring systems for psychotic behavior were constructed and their consistency analyzed by the Rasch item-analysis model. Two major behavioral dimensions, "bizarre behavior" and "psychotic withdrawal," were used for the diagnostic grouping of the subjects. The distributions of the children in regard to developmental retardation, organic brain damage, and psychiatric diagnoses were investigated. Conclusions regarding guidelines for reorganization of present services and establishment of new services are proposed.