The cutoff value of 20 on the CMMS used to identify people with dementia is arbitrary. Suppose we consider changing the cutoff. What are the sensitivity and specificity if cutoffs of 5, 10, 15, 20, 25, or 30 are used? Make a table of your results. 

Mental Health
The Chinese Mini-Mental Status Test (CMMS) consists of 114 items intended to identify people with Alzheimer€™s disease and senile dementia among people in China [14]. An extensive clinical evaluation of this instrument was performed, whereby participants were interviewed by psychiatrists and nurses and a definitive diagnosis of dementia was made. Table 3.13 shows the results obtained for the subgroup of people with at least some formal education. Suppose a cutoff value of ‰¤ 20 on the test is used to identify people with dementia.

Table 3.13: Relationship of clinical dementia to outcome on the Chinese Mini-Mental Status Test

Transcribed Image Text:

CMMS score Nondemented Demented 0-5 2 6-10 11-15 3 16-20 21-25 16 3 26-30 18 Total 16 46