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Article

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

1
National Centre of Epidemiology, Carlos III Health Institute, 28029 Madrid, Spain
2
Center for Health Technology and Services Research (CINTESIS), Department of Education and Psychology of the University of Aveiro, 3810-193 Aveiro, Portugal
3
National School of Public Health, Carlos III Health Institute, 28029 Madrid, Spain
4
Center for Health Technology and Services Research (CINTESIS), Institute of Biomedical Sciences Abel Salazar, University of Porto (ICBAS.UP), 4050-313 Porto, Portugal
5
Center for Health Technology and Services Research (CINTESIS), School of Education, Polytechnic Institute of Viseu (ESEV.IPV), 3504-510 Viseu, Portugal
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(18), 6610; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186610
Received: 29 July 2020 / Revised: 16 August 2020 / Accepted: 9 September 2020 / Published: 11 September 2020
(This article belongs to the Special Issue Instruments for Measuring Health)
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, χ2 (48) = 444.59, p < 0.001), which was confirmed by Rasch analysis (χ2 (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. View Full-Text
Keywords: quality of life; CASP-12; Rasch model; older adults; Portugal quality of life; CASP-12; Rasch model; older adults; Portugal
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MDPI and ACS Style

Rodríguez-Blázquez, C.; Ribeiro, O.; Ayala, A.; Teixeira, L.; Araújo, L.; Forjaz, M.J. Psychometric Properties of the CASP-12 Scale in Portugal: An Analysis Using SHARE Data. Int. J. Environ. Res. Public Health 2020, 17, 6610. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186610

AMA Style

Rodríguez-Blázquez C, Ribeiro O, Ayala A, Teixeira L, Araújo L, Forjaz MJ. Psychometric Properties of the CASP-12 Scale in Portugal: An Analysis Using SHARE Data. International Journal of Environmental Research and Public Health. 2020; 17(18):6610. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186610

Chicago/Turabian Style

Rodríguez-Blázquez, Carmen, Oscar Ribeiro, Alba Ayala, Laetitia Teixeira, Lia Araújo, and Maria J. Forjaz 2020. "Psychometric Properties of the CASP-12 Scale in Portugal: An Analysis Using SHARE Data" International Journal of Environmental Research and Public Health 17, no. 18: 6610. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186610

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