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A standardized rating scale developed by William Guy in 1976 which is used to evaluate the severity of tardive dyskinesia in individuals taking neuroleptic agents. This instrument contains 5 sections with a total of 12 items pertaining to facial and oral movements, global judgments, trunk movements, dental status, and extremity movements. Each item is rated on either a 0 to 4 scale with 0 being none and 4 being severe, or as \'yes\' or \'no.\'
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