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Psychometric Properties of the CASP-12 Scale in Portugal: An Analysis Using SHARE Data

Author

Listed:
  • Carmen Rodríguez-Blázquez

    (National Centre of Epidemiology, Carlos III Health Institute, 28029 Madrid, Spain)

  • Oscar Ribeiro

    (Center for Health Technology and Services Research (CINTESIS), Department of Education and Psychology of the University of Aveiro, 3810-193 Aveiro, Portugal)

  • Alba Ayala

    (National School of Public Health, Carlos III Health Institute, 28029 Madrid, Spain)

  • Laetitia Teixeira

    (Center for Health Technology and Services Research (CINTESIS), Institute of Biomedical Sciences Abel Salazar, University of Porto (ICBAS.UP), 4050-313 Porto, Portugal)

  • Lia Araújo

    (Center for Health Technology and Services Research (CINTESIS), School of Education, Polytechnic Institute of Viseu (ESEV.IPV), 3504-510 Viseu, Portugal)

  • Maria João Forjaz

    (National Centre of Epidemiology, Carlos III Health Institute, 28029 Madrid, Spain)

Abstract

The purpose of this study is to assess the psychometric properties of the Portuguese version of the Control, Autonomy, Self-realization, and Pleasure (CASP)-12 scale used in the Survey of Health, Aging and Retirement in Europe (SHARE) project. Data were obtained from a representative sample of 1666 people aged ≥50 years living in Portugal and participating in the SHARE wave 6. In addition to the CASP-12 scale, sociodemographic data and health status, activity limitation (GALI), depression (Euro-D) and satisfaction with life scores were collected. Data quality and acceptability, construct and structural validity and internal consistency of the CASP-12 scale were analyzed. A Rasch analysis was also performed. CASP-12 total score (mean: 33.3; standard deviation: 5.8, range: 12–48) correlated with Euro-D (−0.57) and with life satisfaction (0.52). Mean scores were significantly lower for women, people aged ≥75 years and those with activity limitations and worse health status ( p < 0.001). The confirmatory factor analysis showed good fit to the 4-factor model (root mean squared error of approximation (RMSEA): 0.07; comparative fit index (CFI): 0.90, χ 2 (48) = 444.59, p < 0.001), which was confirmed by Rasch analysis (χ 2 (36) = 10.089, p = 0.745, person separation index (PSI) = 0.722 for the 4-factor model). For domains, person separation index ranged 0.31–0.79 and Cronbach’s alpha, 0.37–0.73. In conclusion, the Portuguese version of the CASP-12 scale presents some inadequacies in acceptability, internal consistency and structural validity.

Suggested Citation

  • Carmen Rodríguez-Blázquez & Oscar Ribeiro & Alba Ayala & Laetitia Teixeira & Lia Araújo & Maria João Forjaz, 2020. "Psychometric Properties of the CASP-12 Scale in Portugal: An Analysis Using SHARE Data," IJERPH, MDPI, vol. 17(18), pages 1-12, September.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:18:p:6610-:d:411964
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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.
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    2. Chiara Costi, 2022. "Health and quality of life in aging populations: A structural equation modeling approach," French Stata Users' Group Meetings 2022 11, Stata Users Group.
    3. Christoph K. Becker & Stefan T. Trautmann, 2022. "Does Happiness Increase in Old Age? Longitudinal Evidence from 20 European Countries," Journal of Happiness Studies, Springer, vol. 23(7), pages 3625-3654, October.

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