Results generalized well across base rates, with the DSMD producing slightly higher positive predictive power than the TRF, and the TRF exhibiting a greater negative predictive power than the DSMD. Results revealed that PWS represents a highly unique and complex psychological disorder with multiple areas of disturbances. Classification efficiency statistics at the recommended cutoff T -score of 60 for the total scale revealed that the DSMD performed as well as the TRF. The scales investigate conduct and attention disorders, anxiety, depression, autistic-like. When compared to the dually-diagnosed sample, children with PWS Syndrome had comparable levels of psychopathology, but lower levels of depression. The mean age of the children was 9.6 years.The Devereux scales of mental disorders assess behaviour according to the categories given in the third edition (revised) and the fourth edition of the Diagnostic and Statistical Manual of Mental Disorders. The PWS sample exhibited statistically significant higher levels of psychopathology than the mentally-retarded-only sample on the Total, Externalizing, Internalizing, Attention/Delinquency, Conduct, Anxiety, and Acute Problems Scales. Multivariate analyses and "Italic">d-ratios were computed to assess the statistical and clinically meaningful differences between pairs of samples. To examine the behavioral and emotional difficulties of 73 children and adolescents with Prader-Willi Syndrome (PWS), mental retardation-only, and dual diagnosis (i.e., mental retardation and psychiatrically disordered) on the Devereux Scales of Mental Disorders (DSMD: Naglieri, LeBuffe, & Pfeiffer, Devereux Scales of Mental Disorders (DSMD) San Antonio, TX: PsychCorp 1994).
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