Title

Assessing the factor structure of a role functioning item bank

UMMS Affiliation

Department of Quantitative Health Sciences

Date

12-15-2010

Document Type

Article

Medical Subject Headings

Activities of Daily Living; *Health Status; *Interpersonal Relations; *Quality of Life; Social Environment; Role

Disciplines

Bioinformatics | Biostatistics | Epidemiology | Health Services Research

Abstract

PURPOSE: Role functioning (RF) is an important part of health-related quality of life, but is hard to measure due to the wide definition of roles and fluctuations in role participation. This study aims to explore the dimensionality of a newly developed item bank assessing the impact of health on RF.

METHODS: A battery of measures with skip patterns including the new RF bank was completed by 2,500 participants answering only questions on social roles relevant to them. Confirmatory factor analyses were conducted for the participants answering items from all conceptual domains (N = 1193). Conceptually based dimensionality and method effects reflecting positively and negatively worded items were explored in a series of models.

RESULTS: A bi-factor model (CFI = .93, RMSEA = .08) with one general and four conceptual factors (social, family, occupation, generic) was retained. Positively worded items were excluded from the final solution due to misfit. While a single factor model with methods factors had a poor fit (CFI = .88, RMSEA = .13), high loadings on the general factor in the bi-factor model suggest that the RF bank is sufficiently unidimensional for IRT analysis.

CONCLUSIONS: The bank demonstrated sufficient unidimensionality for IRT-based calibration of all the items on a common metric and development of a computerized adaptive test.

Rights and Permissions

Citation: Qual Life Res. 2010 Dec 12. Link to article on publisher's site

Related Resources

Link to Article in PubMed