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Quality of Life Research
Erschienen in: Quality of Life Research 9/2013

01.11.2013

Psychometric evaluation of the CASP-19 quality of life scale in an older Irish cohort

verfasst von: Eithne Sexton, Bellinda L. King-Kallimanis, Ronan M. Conroy, Anne Hickey

Erschienen in: Quality of Life Research | Ausgabe 9/2013

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Abstract

Purpose

This study aims to evaluate the validity of current measurement models for the control, autonomy, self-realisation, and pleasure (CASP) measure of quality of life (QoL)—a second-order four-factor CASP-19 model and a second-order three-factor CASP-12 version—in a recent population survey. A previous large sample study did not report good fit for these measurement models. The study also aims to re-develop the model and propose a well-fitting alternative.

Methods

To evaluate the current measurement models, confirmatory factor analysis (CFA) was used. A cross-sectional sample (n = 6,823) representative of the Irish community-dwelling population aged 50 and over was obtained from the Irish Longitudinal Study of Ageing (TILDA). Model revision was based on descriptive statistics, exploratory factor analysis and examination of fit diagnostic statistics. Revised models were tested using CFA.

Results

The results of the CFA did not support the validity of the established measurement models. A reformulated 12-item, two-factor model comprising control/autonomy and self-realisation/pleasure, with residual covariances for negatively worded items, had excellent fit to the data (χ2 161.90, df = 44, p < 0.001; RMSEA = 0.03, 90 % CI 0.02–0.03), and a clearer conceptual rationale. The same model with one overall QoL factor had similar excellent fit.

Conclusions

We recommend the use of the single-factor model (CASP-R12) when assessing overall quality of life. The dimensions of control/autonomy and self-realisation/pleasure can be examined separately by researchers interested in those constructs. Researchers using structural equation modelling can use the well-fitting measurement model outlined here including adjustment for residual covariances.
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Metadaten
Titel
Psychometric evaluation of the CASP-19 quality of life scale in an older Irish cohort
verfasst von
Eithne Sexton
Bellinda L. King-Kallimanis
Ronan M. Conroy
Anne Hickey
Publikationsdatum
01.11.2013
Verlag
Springer Netherlands
Erschienen in
Quality of Life Research / Ausgabe 9/2013
Print ISSN: 0962-9343
Elektronische ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-013-0388-7

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