- Title
- Validation of a Chinese version of the quality of well-being scale-self-administered (QWB-SA) in patients with epilepsy
- Creator
- Gao, Lan; Xia, Li; Pan, Song-Qing; Xiong, Tao; Li, Shu-Chuen
- Relation
- Epilepsia Vol. 54, Issue 9, p. 1647-1657
- Publisher Link
- http://dx.doi.org/10.1111/epi.12324
- Publisher
- Wiley-Blackwell Publishing
- Resource Type
- journal article
- Date
- 2013
- Description
- Purpose: Generic preference-based health-related quality of life (HRQoL) instruments are increasingly used to estimate the quality-adjusted life years (QALYs) in cost-effectiveness/utility studies. However, no such tool has been used and validated in epilepsy patients in China. This study was conducted to validate a generic preference-based HRQoL instrument, namely the Quality of Well-Being Scale–Self-Administered (QWB-SA) in Chinese patients with epilepsy. Methods: Accepted translation procedures were followed to develop the Chinese QWB-SA. An epilepsy group (adults with established diagnosis of epilepsy) and a control group (adults without manifested cognitive problems) were recruited between July and October, 2012, from two tertiary hospitals in China. After giving informed consent, each subject completed both the QWB-SA and the EuroQol (EQ-5D) as well as provided sociodemographic data. Construct validity was examined by six (convergent) and two (discriminative) a priori hypotheses. Sensitivity was compared by ability to differentiate epilepsy-specific variable-based subgroups. Agreement between the QWB-SA and EQ-5D was assessed by intraclass correlation coefficient (ICC) and Bland-Altman plot. Key Findings: One hundred forty-four epilepsy patients and 323 control subjects were enrolled, respectively. The utility medians (interquartile range, IQR) for the QWB-SA and EQ-5D were 0.673 (0.172), 0.848 (0.275) for epilepsy group and 0.775 (0.258), 1.000 (0.152) for control group, respectively. The difference in utilities between the two measures were significant (p < 0.0001). Construct validity was demonstrated by six a priori hypotheses. In addition, the QWB-SA was able to discriminate across different seizure frequency and antiepileptic drug (AED) treatment subgroups. Agreement between the QWB-SA and EQ-5D was demonstrated by ICC (0.725). Finally, the multiple linear regression analysis indicated that group and the EQ-VAS had influences on the utility difference of these two measures, whereas seizure frequency and number of AEDs were predictors of HRQoL as measured by the QWB-SA. Significance: The QWB-SA is a valid and sensitive HRQoL measure in Chinese patients with epilepsy. Compared to the EQ-5D, the QWB-SA showed superiority in coverage of health dimensions, sensitivity, and ceiling effects. However, future study is still needed to ascertain its responsiveness.
- Subject
- epilepsy; quality of well-being scale–self-administered; EQ-5D; utility; validation study; China
- Identifier
- http://hdl.handle.net/1959.13/1066730
- Identifier
- uon:18202
- Identifier
- ISSN:0013-9580
- Language
- eng
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