Cognitive functioning of individuals aged 90 years and older without dementia: A systematic review

N. Legdeur, T. T. Binnekade, R. H. Otten, M. Badissi, P. Scheltens, P. J. Visser, A. B. Maier

Research output: Contribution to JournalReview articleAcademicpeer-review

Abstract

Introduction Reference values to define cognitive impairment in individuals aged 90 years and older are lacking. We systematically reviewed the literature to determine the level of cognitive functioning of individuals aged 90 years and older without dementia. Methods The search identified 3972 articles of which 20 articles were included in the review. We calculated mean cognitive test scores and cut-off scores for cognitive tests published in two or more articles. Results The mean cognitive test scores (SD)/cut-off scores for individuals aged 90 years and older without dementia of the five most commonly used cognitive tests were: MMSE: 26.6 (2.6)/23.3 points, Digit Span forward: 5.9 (1.8)/3.6 digits, Digit Span backward: 4.4 (1.6)/2.4 digits, TMT-A: 85.8 (42.5)/140.2 s and TMT-B: 220.3 (99.2)/347.3 s. Discussion We provided mean cognitive test scores and cut-off scores that will improve the diagnostic process of cognitive impairment in individuals aged 90 years and older.

Original languageEnglish
Pages (from-to)42-49
Number of pages8
JournalAgeing Research Reviews
Volume36
DOIs
Publication statusPublished - 1 Jul 2017

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Dementia
Reference Values
Cognitive Dysfunction

Keywords

  • Cognitive functioning
  • Cognitive impairment
  • Healthy ageing
  • Individuals aged 90 years and older
  • Nonagenarians
  • Reference values

Cite this

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Cognitive functioning of individuals aged 90 years and older without dementia : A systematic review. / Legdeur, N.; Binnekade, T. T.; Otten, R. H.; Badissi, M.; Scheltens, P.; Visser, P. J.; Maier, A. B.

In: Ageing Research Reviews, Vol. 36, 01.07.2017, p. 42-49.

Research output: Contribution to JournalReview articleAcademicpeer-review

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AU - Binnekade, T. T.

AU - Otten, R. H.

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N2 - Introduction Reference values to define cognitive impairment in individuals aged 90 years and older are lacking. We systematically reviewed the literature to determine the level of cognitive functioning of individuals aged 90 years and older without dementia. Methods The search identified 3972 articles of which 20 articles were included in the review. We calculated mean cognitive test scores and cut-off scores for cognitive tests published in two or more articles. Results The mean cognitive test scores (SD)/cut-off scores for individuals aged 90 years and older without dementia of the five most commonly used cognitive tests were: MMSE: 26.6 (2.6)/23.3 points, Digit Span forward: 5.9 (1.8)/3.6 digits, Digit Span backward: 4.4 (1.6)/2.4 digits, TMT-A: 85.8 (42.5)/140.2 s and TMT-B: 220.3 (99.2)/347.3 s. Discussion We provided mean cognitive test scores and cut-off scores that will improve the diagnostic process of cognitive impairment in individuals aged 90 years and older.

AB - Introduction Reference values to define cognitive impairment in individuals aged 90 years and older are lacking. We systematically reviewed the literature to determine the level of cognitive functioning of individuals aged 90 years and older without dementia. Methods The search identified 3972 articles of which 20 articles were included in the review. We calculated mean cognitive test scores and cut-off scores for cognitive tests published in two or more articles. Results The mean cognitive test scores (SD)/cut-off scores for individuals aged 90 years and older without dementia of the five most commonly used cognitive tests were: MMSE: 26.6 (2.6)/23.3 points, Digit Span forward: 5.9 (1.8)/3.6 digits, Digit Span backward: 4.4 (1.6)/2.4 digits, TMT-A: 85.8 (42.5)/140.2 s and TMT-B: 220.3 (99.2)/347.3 s. Discussion We provided mean cognitive test scores and cut-off scores that will improve the diagnostic process of cognitive impairment in individuals aged 90 years and older.

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