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. 2020 Aug;68 Suppl 3(Suppl 3):S11-S19.
doi: 10.1111/jgs.16738.

Measurement and Structure of Cognition in the Longitudinal Aging Study in India-Diagnostic Assessment of Dementia

Alden L Gross  1 , Pranali Y Khobragade  2 , Erik Meijer  2 , Judith A Saxton  2
Affiliations

Measurement and Structure of Cognition in the Longitudinal Aging Study in India-Diagnostic Assessment of Dementia

Alden L Gross et al. J Am Geriatr Soc. 2020 Aug.

Abstract

Objectives: To test whether a relatively complex model of human cognitive abilities based on Cattell-Horn-Carroll (CHC) theory, developed mainly in English-speaking samples, adequately describes correlations among tests in the Longitudinal Aging Study in India-Diagnostic Assessment of Dementia (LASI-DAD), and to develop accurate measures of cognition for older individuals in India.

Design: LASI-DAD participants were recruited from participants aged 60 years and older from 14 states in the core LASI survey, with a stratified sampling design.

Setting: Participants were interviewed at home or in a participating hospital, according to their preferences.

Participants: Community-residing older adults aged 60 years and older (N = 3,224).

Measurements: A variety of cognitive tests were administered during two pretests and chosen for their appropriateness for measuring cognition in older adults in India and suitability for calibration with the core LASI survey and the Harmonized Cognitive Assessment Protocol.

Results: We evaluated the factor structure of the test battery and its conformity with a classical CHC factor model that incorporated measurement models for general cognition, five broad domains (orientation, executive functioning, language/fluency, memory, and visuospatial), and five narrow domains (reasoning, attention/speed, immediate memory, delayed memory, and recognition memory) of cognitive performance. Model fit was adequate (root mean square error of approximation = 0.051; comparative fit index = 0.916; standardized root mean squared residual = 0.060).

Conclusion: We demonstrated configural factorial invariance of a cognitive battery in the Indian LASI-DAD using CHC theory. Broad domain factors may be used in future research to rank individuals with respect to cognitive performance and classify cognitive impairment. J Am Geriatr Soc 68:S11-S19, 2020.

Keywords: Cattell-Horn-Carroll theory; Harmonized Cognitive Assessment Protocol; epidemiology; factor analysis; international comparisons.

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Conflict of interest statement

Confiict of Interest: The authors have no conflicts, whether personal, financial, or otherwise.

Figures

Figure 1.
Figure 1.
Structural equation model diagram of the hierarchical confirmatory factor analysis: results from Longitudinal Aging Study in India–Diagnostic Assessment of Dementia (N = 3,224). Note: Latent variables (shown in circles) representing general cognition, broad, and narrow cognitive domains were formed from sets of observed cognitive tests (shown in boxes). Residual correlations between test scores are shown with curved double-headed arrows. Numbers on the paths are standardized factor loadings, with a range from 0 to 1, representing the strength of the relationship (e.g., a correlation) between a test item and a latent variable, or among latent variables.
See this image and copyright information in PMC

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