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Measurement Invariance of a Quality-of-life Measure, CASP-12, within the English Longitudinal Study of Ageing (ELSA)

Author

Listed:
  • Ali Alattas

    (University of Leeds
    King Saud bin Abdulaziz for Health Sciences)

  • Farag Shuweihdi

    (University of Leeds)

  • Kate Best

    (University of Leeds)

  • Silviya Nikolova

    (EMEA Real World Methods & Evidence Generation, IQVIA)

  • Robert West

    (University of Leeds)

Abstract

CASP-12 is a frequently used quality of life scale for older people, but limited efforts have been made to test the factor structure or to explore the measurement consistency of the scale across key characteristics. The aim of this study is to examine if the CASP-12 questionnaire has a well-defined factor structure with a second-order structure factor nested within four first-order domains: control, autonomy, pleasure, and self-realization. The study also aims to investigates if this factor structure is interpreted similarly by respondents of different genders, ages, educational levels, net wealth, and at two time periods, using a multi-group confirmatory factor analysis (MG-CFA). The results show that CASP-12 with lower four first-order domains (CASP-12-4D) is consistent across genders and two time periods and satisfies the second-order strong-invariance criteria. Furthermore, the instrument demonstrates consistency in weak levels across three age groups (50–59, 60–69, and 70–90), educational levels and net wealth, but not strong invariance. The sample was divided into three subsamples based on age groups to address this issue. The consistency of CASP-12-4D has met the second-order strong invariance level requirement across gender, age, education level and two-time periods. Net wealth however still fails to meet the strong invariance levels. The CASP-12-4D version will suit social and public health research which controls for age and wealth status.

Suggested Citation

  • Ali Alattas & Farag Shuweihdi & Kate Best & Silviya Nikolova & Robert West, 2024. "Measurement Invariance of a Quality-of-life Measure, CASP-12, within the English Longitudinal Study of Ageing (ELSA)," Applied Research in Quality of Life, Springer;International Society for Quality-of-Life Studies, vol. 19(5), pages 2155-2170, October.
    • Handle: RePEc:spr:ariqol:v:19:y:2024:i:5:d:10.1007_s11482-024-10289-x
    DOI: 10.1007/s11482-024-10289-x
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    References listed on IDEAS

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    1. R. Wiggins & G. Netuveli & M. Hyde & P. Higgs & D. Blane, 2008. "The Evaluation of a Self-enumerated Scale of Quality of Life (CASP-19) in the Context of Research on Ageing: A Combination of Exploratory and Confirmatory Approaches," Social Indicators Research: An International and Interdisciplinary Journal for Quality-of-Life Measurement, Springer, vol. 89(1), pages 61-77, October.
    2. César González-Blanch & Leonardo Adrián Medrano & Roger Muñoz-Navarro & Paloma Ruíz-Rodríguez & Juan Antonio Moriana & Joaquín T Limonero & Florian Schmitz & Antonio Cano-Vindel & on behalf of the Psi, 2018. "Factor structure and measurement invariance across various demographic groups and over time for the PHQ-9 in primary care patients in Spain," PLOS ONE, Public Library of Science, vol. 13(2), pages 1-16, February.
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    5. Karen M van Leeuwen & Miriam S van Loon & Fenna A van Nes & Judith E Bosmans & Henrica C W de Vet & Johannes C F Ket & Guy A M Widdershoven & Raymond W J G Ostelo, 2019. "What does quality of life mean to older adults? A thematic synthesis," PLOS ONE, Public Library of Science, vol. 14(3), pages 1-39, March.
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