Quality of Life Research

, Volume 23, Issue 7, pp 2089–2101

Evaluation properties of the French version of the OUT-PATSAT35 satisfaction with care questionnaire according to classical and item response theory analyses

Authors

    • EA3181University of Franche-Comte
    • Methodological and Quality of Life in Oncology UnitUniversity Hospital of Besançon
  • A. Anota
    • EA3181University of Franche-Comte
    • Quality of Life in Oncology Clinical Research Platform
    • Methodological and Quality of Life in Oncology UnitUniversity Hospital of Besançon
  • T. V. Nguyen
    • EA3181University of Franche-Comte
  • A. Brédart
    • Psycho-Oncology UnitInstitut Curie
  • J. F. Bosset
    • EA3181University of Franche-Comte
    • Oncology-Radiotherapy DepartmentBesançon University Hospital
  • A. Monnier
    • Radiotherapy DepartmentMontbeliard Hospital
  • M. Mercier
    • EA3181University of Franche-Comte
    • Quality of Life in Oncology Clinical Research Platform
  • J. B. Hardouin
    • EA4275-SPHEREUniversity of Nantes
    • Unit of Biostatistics and MethodologyUniversity Hospital of Nantes
Article

DOI: 10.1007/s11136-014-0658-z

Cite this article as:
Panouillères, M., Anota, A., Nguyen, T.V. et al. Qual Life Res (2014) 23: 2089. doi:10.1007/s11136-014-0658-z

Abstract

Purpose

The present study investigates the properties of the French version of the OUT-PATSAT35 questionnaire, which evaluates the outpatients’ satisfaction with care in oncology using classical analysis (CTT) and item response theory (IRT).

Methods

This cross-sectional multicenter study includes 692 patients who completed the questionnaire at the end of their ambulatory treatment. CTT analyses tested the main psychometric properties (convergent and divergent validity, and internal consistency). IRT analyses were conducted separately for each OUT-PATSAT35 domain (the doctors, the nurses or the radiation therapists and the services/organization) by models from the Rasch family. We examined the fit of the data to the model expectations and tested whether the model assumptions of unidimensionality, monotonicity and local independence were respected.

Results

A total of 605 (87.4 %) respondents were analyzed with a mean age of 64 years (range 29–88). Internal consistency for all scales separately and for the three main domains was good (Cronbach’s α 0.74–0.98). IRT analyses were performed with the partial credit model. No disordered thresholds of polytomous items were found. Each domain showed high reliability but fitted poorly to the Rasch models. Three items in particular, the item about “promptness” in the doctors’ domain and the items about “accessibility” and “environment” in the services/organization domain, presented the highest default of fit. A correct fit of the Rasch model can be obtained by dropping these items. Most of the local dependence concerned items about “information provided” in each domain. A major deviation of unidimensionality was found in the nurses’ domain.

Conclusions

CTT showed good psychometric properties of the OUT-PATSAT35. However, the Rasch analysis revealed some misfitting and redundant items. Taking the above problems into consideration, it could be interesting to refine the questionnaire in a future study.

Keywords

Satisfaction with careOUT-PATSAT35 questionnaireCancerItem response theoryClassical test theory

Abbreviations

AIC

Akaike information criterion

CT

Chemotherapy

CTT

Classical test theory

DIF

Differential item functioning

EFA

Exploratory factor analysis

EORTC

European Organization for Research and Treatment of Cancer

HRQoL

Health-related quality of life

IRT

Item response theory

PCA

Principal component analysis

PCM

Partial credit model

PRO

Patient-reported outcomes

SC

Satisfaction with care

SD

Standard deviation

RSM

Rating scale model

RT

Radiotherapy

Supplementary material

11136_2014_658_MOESM1_ESM.doc (70 kb)
Supplementary material 1 (DOC 69 kb)
11136_2014_658_MOESM2_ESM.doc (30 kb)
Supplementary material 2 (DOC 30 kb)
11136_2014_658_MOESM3_ESM.doc (54 kb)
Supplementary material 3 (DOC 53 kb)

Copyright information

© Springer International Publishing Switzerland 2014