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Health and Quality of Life Outcomes
Published in: Health and Quality of Life Outcomes 1/2019

Open Access 01-12-2019 | Prostate Cancer | Research

Validation of the Italian version of the abbreviated expanded prostate Cancer index composite (EPIC-26) in men with prostate Cancer

Authors: Chiara Marzorati, Dario Monzani, Ketti Mazzocco, Marianna Masiero, Francesca Pavan, Massimo Monturano, Gabriella Pravettoni

Published in: Health and Quality of Life Outcomes | Issue 1/2019

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Abstract

Background

This study aims to validate and evaluate the psychometric properties and reliability of the Italian version of the Expanded Prostate Cancer Index Composite – Short Form (EPIC-26), a measure of quality of life (QoL) for prostate cancer patients.

Methods

Two hundred and eighty-four prostate cancer patients completed the Italian version of the EPIC-26 questionnaire at 45 days (T1) and 3 months (T2) after robot-assisted radical prostatectomy (RARP). Psychometric properties were evaluated using structural equation modeling: the goodness of fit of the correlated five-factor model (CFFM) for the EPIC-26 was assessed using the confirmatory factor analysis (CFA), while longitudinal invariance was conducted to assess the ability of the EPIC-26 to measure QoL construct over time. Test-retest reliability was assessed as well by considering intraclass correlations.

Results

At T1, the CFFM model displayed a good fit to data. Similarly, the model showed an adequate fit also at T2. Results of the reliability analysis attested the acceptable internal consistency and test-retest reliability of each dimension: all Cronbach’s alphas could be classified as acceptable (i.e., above .65) except for low Cronbach’s alpha for hormonal dysfunction at T1 (i.e., .638) and urinary irritation at both waves. (i.e., respectively .585 and .518). Finally, psychometric properties were invariant over time and each of the five dimensions of QoL displayed from moderate (all ICCs above .500) to good test-retest reliability (i.e. ICC for urinary incontinence = .764).

Conclusions

Results of the CFA and the measurement invariance analysis demonstrated the validity of the Italian version of the EPIC-26 to assess QoL in prostate cancer patients. Its reliability and good psychometric qualities are well-supported, thus providing a valid tool to assess health-related quality of life and its change over time in prostate cancer patients.
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Metadata
Title
Validation of the Italian version of the abbreviated expanded prostate Cancer index composite (EPIC-26) in men with prostate Cancer
Authors
Chiara Marzorati
Dario Monzani
Ketti Mazzocco
Marianna Masiero
Francesca Pavan
Massimo Monturano
Gabriella Pravettoni
Publication date
01-12-2019
Publisher
BioMed Central
Published in
Health and Quality of Life Outcomes / Issue 1/2019
Electronic ISSN: 1477-7525
DOI
https://doi.org/10.1186/s12955-019-1214-x

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