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Sep 26, 2013 Therefore, this study was performed under the hypothesis that 'serial subtraction from 40-4,' 'serial subtraction from 20-2,' 'serial subtraction from 10-1,' and others may have better correlation to the global deterioration scale, which shows the severity of dementia, than 'serial subtraction from 100-7' in the K-MMSE for uneducated participants.
Serial sevens, counting down from one hundred by sevens, is a clinical test used to test mental function; for example, to help assess mental status after possible head injury or in suspected cases of dementia. This well-known test, in active documented use since at least 1944,[1] was adopted as part of the mini-mental state examination. The test is also used in determining when a patient is becoming unconscious under anaesthetic, for example prior to major dental surgery.
On its own, the inability to perform 'serial sevens' is not diagnostic of any particular disorder or impairment, but is generally used as a quick and easy test of concentration and memory in any number of situations where clinicians suspect that these cognitive functions might be affected. Each subtraction is considered as a unit and calculations are made on the basis of the 14 possible correct subtractions, that is 93-86-79-72-65-58-51-44-37-30-23-16-9-2.[2]
Serial 7 Subtraction
Similar tests include serial threes where the counting downwards is done by threes, reciting the months of the year in reverse order, or spelling 'world' backwards.
A study involving uninjured high school athletes concluded that the serial sevens test is not appropriate when testing for concussion because it lacks specificity; the pass rate is too low to give any meaningful result. The ability to recite the months in reverse order was thought to be a more effective measure because the pass rate was higher for that test in uninjured athletes.[3]
The numbers of the serial sevens test are a recurring motif in Sarah Kane's play 4.48 Psychosis.
References[edit]
- ^Jurgen Ruesch (1944). 'Intellectual Impairment in Head Injuries'. The American Journal of Psychiatry. 100 (4): 480–496. doi:10.1176/ajp.100.4.480.
- ^Manning, Robert Thomas (1982). 'The Serial Sevens Test'. Archives of Internal Medicine. 142 (6): 1192. doi:10.1001/archinte.1982.00340190148022. PMID7092427.
- ^Young, Cc; Jacobs, Ba; Clavette, K; Mark, Dh; Guse, Ce (Jul 1997). 'Serial sevens: not the most effective test of mental status in high school athletes'. Clinical Journal of Sport Medicine. 7 (3): 196–8. doi:10.1097/00042752-199707000-00008. ISSN1050-642X. PMID9262887.
Serial 7 Subtractions
![Subtraction Subtraction](https://s-media-cache-ak0.pinimg.com/564x/1f/2c/77/1f2c77c46c9914af87a01449697f207f.jpg)
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Serial 7
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