Journal article
Rasch analysis of SF-Qualiveen in multiple sclerosis.
- 2016-07-28
Published in:
- Neurourology and urodynamics. - 2017
Rasch
SF-Qualiveen
multiple sclerosis
quality of life
urinary dysfunction
Adult
Aged
Female
Health Status Indicators
Humans
Male
Middle Aged
Multiple Sclerosis
Patient Outcome Assessment
Psychometrics
Quality of Life
Self Report
Surveys and Questionnaires
Urinary Bladder, Neurogenic
Urination Disorders
Young Adult
English
BACKGROUND
A 30-item Qualiveen questionnaire was developed to measure the impact of urinary problems on everyday living in spinal cord injury, and subsequently an 8-item SF-Qualiveen was developed for those with multiple sclerosis (MS). The validity of this short form has not been previously examined using modern psychometric techniques, such as the Rasch measurement model.
OBJECTIVE
The aim of this study is to test if the short form meets the requirements of the Rasch model.
METHODS
A total of 401 patients with clinically definite MS were given the questionnaire at three neuroscience centres in the UK.
RESULTS
A total of 258 patients (64.3% response) completed the questionnaire. The original scale failed to meet the expectations of the Rasch model. A two-testlet solution was sought to account for local dependence, differential item functioning and disordered thresholds. After the modifications were made the scale fitted the model (χ2 = 5.93 P = 0.4305), had high internal consistency (α = 0.88) and was unidimensional.
CONCLUSIONS
SF-Qualiveen is a simple and valid measure of the impact of urinary problems in multiple sclerosis, which meets the requirements of the Rasch measurement model. Summed ordinal scores can be converted to interval-level using the transformation table provided.
A 30-item Qualiveen questionnaire was developed to measure the impact of urinary problems on everyday living in spinal cord injury, and subsequently an 8-item SF-Qualiveen was developed for those with multiple sclerosis (MS). The validity of this short form has not been previously examined using modern psychometric techniques, such as the Rasch measurement model.
OBJECTIVE
The aim of this study is to test if the short form meets the requirements of the Rasch model.
METHODS
A total of 401 patients with clinically definite MS were given the questionnaire at three neuroscience centres in the UK.
RESULTS
A total of 258 patients (64.3% response) completed the questionnaire. The original scale failed to meet the expectations of the Rasch model. A two-testlet solution was sought to account for local dependence, differential item functioning and disordered thresholds. After the modifications were made the scale fitted the model (χ2 = 5.93 P = 0.4305), had high internal consistency (α = 0.88) and was unidimensional.
CONCLUSIONS
SF-Qualiveen is a simple and valid measure of the impact of urinary problems in multiple sclerosis, which meets the requirements of the Rasch measurement model. Summed ordinal scores can be converted to interval-level using the transformation table provided.
- Language
-
- English
- Open access status
- closed
- Identifiers
-
- DOI 10.1002/nau.23081
- PMID 27460549
- Persistent URL
- https://sonar.ch/global/documents/249483
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