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Assessing the factor structure of a role functioning item bank.

Milena D Anatchkova¹, John E Ware, Jakob B Bjorner

¹Department of Quantitative Health Sciences, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01665-002, USA. Milena.Anatchkova@umassmed.edu

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation

|December 15, 2010

Summary

This study found that a new role functioning (RF) item bank is sufficiently unidimensional for developing advanced measurement tools. This supports its use in health-related quality of life assessments.

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Area of Science:

Psychometrics
Health Outcomes Research
Quality of Life Measurement

Background:

Role functioning (RF) is a key component of health-related quality of life.
Measuring RF is challenging due to broad definitions and variable participation.
A new item bank was developed to assess the impact of health on RF.

Purpose of the Study:

To explore the dimensionality of a new item bank designed to measure role functioning.
To determine if the item bank is suitable for item response theory (IRT) analysis.

Main Methods:

Confirmatory factor analyses were performed on data from 2,500 participants.
A bi-factor model was evaluated to assess dimensionality.
Models explored conceptual factors and method effects from item wording.

Main Results:

A bi-factor model with one general and four conceptual factors (social, family, occupation, generic) demonstrated adequate fit.
Positively worded items were removed due to misfit.
High loadings on the general factor indicated sufficient unidimensionality for IRT analysis.

Conclusions:

The role functioning item bank exhibits sufficient unidimensionality.
This supports IRT-based calibration and the development of a computerized adaptive test for RF.