The scale is closely linked to the Scale for the Assessment of Positive Symptoms (SAPS), which was published a few years later. Within each domain it rates separate symptoms from 0 (absent) to 5 (severe). SANS splits assessment into five domains. Nancy Andreasen developed the scale and first published it in 1984. Negative symptoms are those conspicuous by their absence-lack of concern for one's appearance, and lack of language and communication skills, for example. The Scale for the Assessment of Negative Symptoms ( SANS) is a rating scale that mental health professionals use to measure negative symptoms in schizophrenia.
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