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Erschienen in:
12.08.2020 | Original Article
The German linguistic validation of the Wisconsin Stone Quality of Life questionnaire (WisQoL)
Erschienen in: World Journal of Urology | Ausgabe 6/2021
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Purpose
WisQoL (Wisconsin Stone Quality of Life questionnaire) is a disease specific, health related quality of life measure designed for patients who form kidney stones. The goal of this study was to develop and validate a German version of WisQoL.
Methods
The German version of the WisQoL was developed following a standardized multistep process. Patients were recruited prior to stone treatment, and completed the questionnaire as well as the SF-36v2 (36-Item Short Form Health Survey). This was repeated 1, 3, and 6 months after stone surgery. Scores of the 28 questionnaire items were summarized into sum scores for four domains and a total score. The psychometric properties of the questionnaire were statistically analyzed.
Results
The German WisQoL demonstrated excellent internal consistency (Cronbach’s α > 0.90 for all domains at all visits). All inter-domain associations were positive. The test–retest reliability for patients with unchanged self-reported health state was considered satisfactory (Spearman’s rho for total score 0.70 [95% CI 0.55 to − 0.80]). The German WisQoL demonstrated good convergent validity with the validated SF-36v2 (correlation between corresponding items 0.44 to 0.64). All domain scores showed significant sensitivity to change induced by stone treatment (p ≤ 0.05). Total WisQoL scores generally improved during the first 3 months following stone treatment, and remained stable thereafter.
Conclusion
The German WisQoL proved to be a reliable and robust instrument to evaluate health related quality of life measures of kidney stone patients in the clinical setting. It is expected to be of use for further research in patients with kidney stones.