Original Research

Sensitivity and specificity of neuropsychological tests for dementia and mild cognitive impairment in a sample of residential elderly in South Africa

Suvira Ramlall, Jennifer Chipps, Ahmed I Bhigjee, Basil J Pillay
South African Journal of Psychiatry | Vol 20, No 4 | a558 | DOI: https://doi.org/10.4102/sajpsychiatry.v20i4.558 | © 2014 Suvira Ramlall, Jennifer Chipps, Ahmed I Bhigjee, Basil J Pillay | This work is licensed under CC Attribution 4.0
Submitted: 11 January 2014 | Published: 30 November 2014

About the author(s)

Suvira Ramlall, Department of Psychiatry, School of Clinical Medicine, University of KwaZulu-Natal, Durban, South Africa, South Africa
Jennifer Chipps, School of Nursing, Faculty of Community and Health Science, University of the Western Cape, Cape Town, South Africa, South Africa
Ahmed I Bhigjee, Department of Neurology, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa, South Africa
Basil J Pillay, Department of Behavioural Medicine, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa, South Africa

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Abstract

Background. Neuropsychological tests can successfully distinguish between healthy elderly persons and those with clinically significant cognitive impairment. 

Objectives. A battery of neuropsychological tests was evaluated for their discrimination validity of cognitive impairment in a group of elderly persons in Durban, South Africa. 

Method. A sample of 117 English-speaking participants of different race groups (9 with dementia, 30 with mild cognitive impairment (MCI) and 78 controls) from a group of residential homes for the elderly was administered a battery of 11 neuropsychological tests. Kruskal-Wallis independent sample tests were used to compare performance of tests in the groups. Sensitivity and specificity of the tests for dementia and MCI were determined using random operating curve (ROC) analysis. 

Results. Most tests were able to discriminate between participants with dementia or MCI, and controls (p<0.05). Area under the curve (AUC) values for dementia v. non-dementia participants ranged from 0.519 for the digit span (forward) to 0.828 for the digit symbol (90 s), with 14 of the 29 test scores achieving significance (p<0.05). AUC values for MCI participants ranged from 0.754 for controlled oral word association test (COWAT) Animal to 0.507 for the Rey complex figure test copy, with 17 of the 29 scores achieving significance (p<0.05). 

Conclusions. Several measures from the neuropsychological battery had discrimination validity for the differential diagnosis of cognitive disturbances in the elderly. Further studies are needed to assess the effect of culture and language on the appropriateness of the tests for different populations.


Keywords

Older adults;D; MCI; Neuropsychological tests

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