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

Carmen Rodríguez-Blázquez, Oscar Ribeiro, Alba Ayala, Laetitia Teixeira, Lia Araújo and Maria João Forjaz
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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

IJERPH, 2020, vol. 17, issue 18, 1-12

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.

Keywords: quality of life; CASP-12; Rasch model; older adults; Portugal (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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