Publication Type
Journal Article
Version
acceptedVersion
Publication Date
9-2025
Abstract
Objective: To ascertain the construct validity and reliability of a self-administered web-based assessment of intrinsic capacity (IC). Design: Cross-sectional data analysis of a prospective cohort study. Settings and Participants: We included data from 6,434 respondents (age, mean (SD): 65.33 (5.81) years; 52.4% women) of the Singapore Life Panel population study who participated in the online surveys in March 2022 and May 2022.MethodsIncremental nested factor structures of IC were modelled with confirmatory factor analysis (CFA) and their goodness-of-fit were assessed mainly with root mean square error of approximation (RMSEA), comparative fit index (CFI), Tucker-Lewis index (TLI), and standardized root mean square residual (SRMR). With the most parsimonious model as our eventual factor structure, we further evaluated IC and its domains with reliability indices.ResultsCFA demonstrated construct validity for the second-order factor structure with acceptable overall model fit (χ2(147)=7,696.276, p0.9) whereas vitality and sensory domains have lower values of CR.Conclusionsand Implications: Our study provides proof-of-concept evidence regarding the construct validity and reliability of a self-administered web-based assessment of IC index that can potentially be scalable in other population settings.
Keywords
Aged, healthy ageing, factor analysis, reproducibility of results, self report, health surveys
Discipline
Health Psychology
Research Areas
Sociology
Publication
Annals of Geriatric Medicine and Research
First Page
1
Last Page
21
ISSN
2508-4798
Identifier
10.4235/agmr.25.0036
Publisher
Korean Geriatrics Society
Citation
STRAUGHAN, Paulin Tay, TOV, William, LAU, Lay Khoon, CHEONG, Li Ling Grace, TAN, Chong Sheng Micah, TOV, William, DING, Yew Yoong, & LIM, Wee Shiong.(2025). Reliability and validity of a self-administrated online assessment of intrinsic capacity: a Singapore cohort study. Annals of Geriatric Medicine and Research, , 1-21.
Available at: https://ink.library.smu.edu.sg/soss_research/4233
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Additional URL
https://doi.org/10.4235/agmr.25.0036