Preference measure that was designed to measure health related quality of life.
Developed based on theory from the General Health Policy Model which incorporates the concepts of mortality, morbidity, the preference of an individual for a certain health state and the duration in that particular health state.
The QWB self-administered (QWB-SA) version combines three scales:
2) Physical Activity
3) Social Activity with a measure of symptoms/problems.
This version contains slightly different content and the recall period was decreased from six days to three days to reduce recall bias.
The QWB-SA is a preference-based measure that has been used in individuals with SCI. It can provide information on health related quality of life and produces a utility value which can be used to calculate quality adjusted life years required for economic analyses.
It is not recommended to complete the QWB-SA by proxy.
82% acceptability has been reported for the QWB, with the mean (SD) time taken to complete the test being 10.5 (3.2) min.
The original version of the QWB was designed to be interviewer administered.
The QWB-SA is designed to be self-administered.
The QWB-SA is reported to be easier to complete compared to the original QWB measure. It takes approximately 10 minutes to complete.
Number of Items
The QWB-SA score is calculated by subtracting the combination of the maximum weighted symptom/problem item and the weights associated with mobility, social activity and physical function from a “perfect” score of 1.0.
An overall utility score is calculated between 0.0 and 1.0; where 0.0 represents death and 1.0 represent perfect health.
The QWB-SA is available in various languages (though none are specified).
Training is required for the interview-based QWB.
Telephone Screening Interview can be found here.
QWB-SA Manual can be found here.
Andresen EM, Fouts BS, Romeis JC, Brownson CA. Performance of health related quality of life instruments in a spinal cord injured population. Arch Phys Med Rehabil 1999;80:877-884. http://www.ncbi.nlm.nih.gov/pubmed/10453762
Le QA, Doctor JN, Zoellner LA, Feeny NC. Minimal clinically important differences for the EQ-5D and QWB-SA in Post-traumatic Stress Disorder (PTSD): results from a Doubly Randomized Preference Trial (DRPT). Health Qual Life Outcomes. 2013;11:59. http://www.ncbi.nlm.nih.gov/pubmed/23587015