title: Reliability, validity, and a total score cutoff for the dyskinesia identification system: condensed user scale (DISCUS) with mentally ill and mentally retarded populations.
abstract: The reliability and validity of the Dyskinesia Identification System: Condensed User Scale (DISCUS) are presented for mentally ill (n = 2,822) and mentally retarded (n = 4,649) populations, as are DISCUS item means and standard deviations. A total score cutoff was developed and tested against physician diagnosis and the Research Diagnoses for Tardive Dyskinesia (RD-TD) intensity criterion. DISCUS total score significantly increased as age increased and was significantly greater for 108 TD cases compared to 108 matched no-TD cases. The DISCUS total score of 5 or above was significantly associated with physician TD diagnosis, the RD-TD intensity criterion, and an increasing number of individuals meeting the cutoff score as age increased. Based upon the data, the DISCUS is a reliable and valid TD assessment instrument. It is concluded that the DISCUS cutoff score is as valid a measure of TD as the current operationally defined RD-TD intensity criterion.
authors.affiliation: Institute for Research on Human Development, University of Illinois, Champaign 61820.
authors.forename: R L
authors.initials: RL
authors.lastname: Sprague
authors.forename: J E
authors.initials: JE
authors.lastname: Kalachnik
mesh_terms: D000328:Adult; D004409:Dyskinesia, Drug-Induced / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000150:complications*; D008297:Male; D001523:Mental Disorders / Q000150:complications*