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December 2021; 11 (6) ResearchOpen Access

Improved Cognitive Function in the Tromsø Study in Norway From 2001 to 2016

Bente Johnsen, Bjørn Heine Strand, Ieva Martinaityte, Ellisiv B. Mathiesen, Henrik Schirmer
First published July 1, 2021, DOI: https://doi.org/10.1212/CPJ.0000000000001115
Bente Johnsen
Department of Clinical Medicine (BJ, IM, EBM, HS), UiT The Arctic University of Norway; Department of Medicine (BJ, IM), University Hospital of North Norway, Tromsø; Norwegian Institute of Public Health (BHS), Oslo; Department of Neurology (EBM), University Hospital of North Norway, Tromsø; Department of Cardiology (HS), Akershus University Hospital, Lørenskog; and Institute of Clinical Medicine (HS), University of Oslo, Norway.
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Bjørn Heine Strand
Department of Clinical Medicine (BJ, IM, EBM, HS), UiT The Arctic University of Norway; Department of Medicine (BJ, IM), University Hospital of North Norway, Tromsø; Norwegian Institute of Public Health (BHS), Oslo; Department of Neurology (EBM), University Hospital of North Norway, Tromsø; Department of Cardiology (HS), Akershus University Hospital, Lørenskog; and Institute of Clinical Medicine (HS), University of Oslo, Norway.
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Ieva Martinaityte
Department of Clinical Medicine (BJ, IM, EBM, HS), UiT The Arctic University of Norway; Department of Medicine (BJ, IM), University Hospital of North Norway, Tromsø; Norwegian Institute of Public Health (BHS), Oslo; Department of Neurology (EBM), University Hospital of North Norway, Tromsø; Department of Cardiology (HS), Akershus University Hospital, Lørenskog; and Institute of Clinical Medicine (HS), University of Oslo, Norway.
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Ellisiv B. Mathiesen
Department of Clinical Medicine (BJ, IM, EBM, HS), UiT The Arctic University of Norway; Department of Medicine (BJ, IM), University Hospital of North Norway, Tromsø; Norwegian Institute of Public Health (BHS), Oslo; Department of Neurology (EBM), University Hospital of North Norway, Tromsø; Department of Cardiology (HS), Akershus University Hospital, Lørenskog; and Institute of Clinical Medicine (HS), University of Oslo, Norway.
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Henrik Schirmer
Department of Clinical Medicine (BJ, IM, EBM, HS), UiT The Arctic University of Norway; Department of Medicine (BJ, IM), University Hospital of North Norway, Tromsø; Norwegian Institute of Public Health (BHS), Oslo; Department of Neurology (EBM), University Hospital of North Norway, Tromsø; Department of Cardiology (HS), Akershus University Hospital, Lørenskog; and Institute of Clinical Medicine (HS), University of Oslo, Norway.
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Improved Cognitive Function in the Tromsø Study in Norway From 2001 to 2016
Bente Johnsen, Bjørn Heine Strand, Ieva Martinaityte, Ellisiv B. Mathiesen, Henrik Schirmer
Neurol Clin Pract Dec 2021, 11 (6) e856-e866; DOI: 10.1212/CPJ.0000000000001115

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Abstract

Background and Objectives Physical capacity and cardiovascular risk profiles seem to be improving in the population. Cognition has been improving due to a birth cohort effect, but evidence is conflicting on whether this improvement remains in the latest decades and what is causing the changes in our population older than 60 years. We aimed to investigate birth cohort differences in cognition.

Methods The study comprised 9,514 participants from the Tromsø Study, an ongoing longitudinal cohort study. Participants were aged 60–87 years, born between 1914 and 1956. They did 4 cognitive tests in 3 waves during 2001–2016. Linear regression was applied and adjusted for age, education, blood pressure, smoking, hypercholesterolemia, stroke, heart attack, depression, diabetes, physical activity, alcohol use, BMI, and height.

Results Cognitive test scores were better in later-born birth cohorts for all age groups, and in both sexes, compared with earlier-born cohorts. Increased education, physical activity, alcohol intake, decreasing smoking prevalence, and increasing height were associated with one-third of this improvement across birth cohorts in women and one-half of the improvement in men.

Discussion Cognitive results were better in more recent-born birth cohorts compared with earlier born, assessed at the same age. The improvement was present in all cognitive domains, suggesting an overall improvement in cognitive performance. The 80-year-olds assessed in 2015–2016 performed like 60-year-olds assessed in 2001. The improved scores were associated with increased education level, increase in modest drinking frequency, increased physical activity, and, for men, smoking cessation and increased height.

Footnotes

  • Funding information and disclosures are provided at the end of the article. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp.

  • Received January 15, 2021.
  • Accepted May 21, 2021.
  • Copyright © 2021 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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