Abstract
Methods
A set of different instruments including 75 newly developed items asking about the impact of health on role functioning was
completed by 2,500 participants. Established item response theory methods were used to develop an item bank based on the generalized
partial credit model. Comparison of group mean bank scores of participants with different self-reported general health status
and chronic conditions was used to test the external validity of the bank.
completed by 2,500 participants. Established item response theory methods were used to develop an item bank based on the generalized
partial credit model. Comparison of group mean bank scores of participants with different self-reported general health status
and chronic conditions was used to test the external validity of the bank.
Results
After excluding items that did not meet established requirements, the final item bank consisted of a total of 64 items covering
three areas of role functioning (family, social, and occupational). Slopes in the bank ranged between .93 and 4.37; the mean
threshold range was −1.09 to −2.25. Item bank-based scores were significantly different for participants with and without
chronic conditions and with different levels of self-reported general health.
three areas of role functioning (family, social, and occupational). Slopes in the bank ranged between .93 and 4.37; the mean
threshold range was −1.09 to −2.25. Item bank-based scores were significantly different for participants with and without
chronic conditions and with different levels of self-reported general health.
Conclusions
An item bank assessing health impact on RF across three content areas has been successfully developed. The bank can be used
for development of short forms or computerized adaptive tests to be applied in the assessment of role functioning as one of
the common denominators across applications of generic health assessment.
for development of short forms or computerized adaptive tests to be applied in the assessment of role functioning as one of
the common denominators across applications of generic health assessment.
- Content Type Journal Article
- Pages 1-13
- DOI 10.1007/s11136-011-0076-4
- Authors
- Milena D. Anatchkova, Department of Quantitative Health Sciences, Medical School, University of Massachusetts, 55 Lake Avenue North, Worcester, MA, USA
- Matthias Rose, Department of Quantitative Health Sciences, Medical School, University of Massachusetts, 55 Lake Avenue North, Worcester, MA, USA
- John E. Ware, Department of Quantitative Health Sciences, Medical School, University of Massachusetts, 55 Lake Avenue North, Worcester, MA, USA
- Jakob B. Bjorner, National Institute of Occupational Health, Copenhagen, Denmark
- Journal Quality of Life Research
- Online ISSN 1573-2649
- Print ISSN 0962-9343