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Open AccessArticle

Using an Overlapping Time Interval Strategy to Study Diagnostic Instability in Mild Cognitive Impairment Subtypes

1
Department of Developmental Psychology, University de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
2
Department of Methodology of Behavioural Sciences, University of Barcelona, 08035 Barcelona, Catalunya, Spain
*
Author to whom correspondence should be addressed.
Brain Sci. 2019, 9(9), 242; https://doi.org/10.3390/brainsci9090242
Received: 21 August 2019 / Revised: 17 September 2019 / Accepted: 18 September 2019 / Published: 19 September 2019
(This article belongs to the Special Issue Cognitive Aging)
(1) Background: Mild cognitive impairment (MCI) is a diagnostic label in which stability is typically low. The aim of this study was to examine temporal changes in the diagnosis of MCI subtypes by using an overlapping-time strategy; (2) Methods: The study included 435 participants aged over 50 years with subjective cognitive complaints and who completed at least one follow-up evaluation. The probability of transition was estimated using Bayesian odds ratios; (3) Results: Within the different time intervals, the controls with subjective cognitive complaints represented the largest proportion of participants, followed by sda-MCI at baseline and in the first five intervals of the follow-up, but not in the last eight intervals. The odds ratios indicated higher odds of conversion to dementia in sda-MCI and mda-MCI groups relative to na-MCI (e.g., interval 9–15 months—sda-MCI OR = 9 and mda-MCI OR = 3.36; interval 27–33—sda-MCI OR = 16 and mda-MCI = 5.06; interval 42–48—sda-MCI OR = 8.16 and mda-MCI = 3.45; interval 45–51—sda-MCI OR = 3.31 and mda-MCI = 1); (4) Conclusions: Notable patterns of instability consistent with the current literature were observed. The limitations of a prospective approach in the study of MCI transitions are discussed. View Full-Text
Keywords: cognitive aging; mild cognitive impairment; subjective cognitive complaints; conversion to dementia; Bayesian odds ratios; time overlapping intervals; screening and diagnosis cognitive aging; mild cognitive impairment; subjective cognitive complaints; conversion to dementia; Bayesian odds ratios; time overlapping intervals; screening and diagnosis
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Facal, D.; Guàrdia-Olmos, J.; Pereiro, A.X.; Lojo-Seoane, C.; Peró, M.; Juncos-Rabadán, O. Using an Overlapping Time Interval Strategy to Study Diagnostic Instability in Mild Cognitive Impairment Subtypes. Brain Sci. 2019, 9, 242.

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