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Garcia-Sanchez, CarmenAuthor

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May 13, 2014
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The Subjective Cognitive Decline Questionnaire (SCD-Q): A Validation Study

Publicated to:Journal Of Alzheimer's Disease. 41 (2): 453-466 - 2014-02-02 41(2), DOI: 10.3233/JAD-132027

Authors: Rami, Lorena; Mollica, Maria A; Garcia-Sanchez, Carmen; Saldana, Judith; Sanchez, Belen; Sala, Isabel; Valls-Pedret, Cinta; Castellvi, Magda; Olives, Jaume; Molinuevo, Jose L

Affiliations

Endocrinology and Nutrition Service - Author
Hospital Clinic Barcelona - Author
Hospital de la Santa Creu i Sant Pau - Author
Institut d'Investigacions Biomèdiques August Pi i Sunyer - IDIBAPS - Author

Abstract

Subjective cognitive decline (SCD) is gaining importance as a focus of investigation, but adequate tools are needed for its quantification.To develop and validate a questionnaire to quantify SCD, termed the Subjective Cognitive Decline Questionnaire (SCD-Q).124 controls (CTR), 144 individuals with SCD, 83 mild cognitive impairment subjects, 46 Alzheimer's disease patients, and 397 informants were included. The SCD-Q contains: part I, named MyCog, which is answered by the subject; and part II, TheirCog, which includes the same questions and is answered by the informant or caregiver. The 24 SCD-Q items assess the perceived subjective decline in memory, language, and executive functions in the last two years.The MyCog scores of controls differed significantly from those of the other groups (p < 0.05) and there were significant differences in TheirCog scores between all groups. The optimal TheirCog cut-off score for discriminating between individuals with and without cognitive impairment was 7/24 (sensitivity 85%, specificity 80%). MyCog scores correlated significantly with anxiety and depression (r = 0.29, r = 0.43, p < 0.005), but no correlations were found with neuropsychological tests. TheirCog scores correlated significantly with most of the neuropsychological tests (p < 0.05). Informants' depression and anxiety influenced TheirCog scores in controls and SCD groups.Self-perceived cognitive decline, measured by the SCD-Q part I (MyCog), discriminated SCD from CTR. Part II (TheirCog) was strongly related to subjects' objective cognitive performance, and discriminated between subjects with or without cognitive impairment. The SCD-Q is a useful tool to measure self-perceived cognitive decline incorporating the decliner and the informant perspective.

Keywords

alzheimer's diseasecognitiondiagnosismemoryAlzheimer's diseaseCognitionDiagnosisMemoryTest

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Journal Of Alzheimer's Disease due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2014, it was in position 58/252, thus managing to position itself as a Q1 (Primer Cuartil), in the category Neurosciences.

From a relative perspective, and based on the normalized impact indicator calculated from World Citations provided by WoS (ESI, Clarivate), it yields a value for the citation normalization relative to the expected citation rate of: 2.7. This indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: ESI Nov 14, 2024)

This information is reinforced by other indicators of the same type, which, although dynamic over time and dependent on the set of average global citations at the time of their calculation, consistently position the work at some point among the top 50% most cited in its field:

  • Weighted Average of Normalized Impact by the Scopus agency: 6.34 (source consulted: FECYT Feb 2024)
  • Field Citation Ratio (FCR) from Dimensions: 23.42 (source consulted: Dimensions Aug 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-08-14, the following number of citations:

  • WoS: 102
  • Scopus: 111
  • Europe PMC: 66

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-08-14:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 288.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 287 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 7.
  • The number of mentions on the social network X (formerly Twitter): 1 (Altmetric).