Turkish Journal of Urology
GENERAL UROLOGY - Original Article

Validation of the Turkish version of the Wisconsin stone-quality of life questionnaire


Department of Urology, Okmeydanı Training and Research Hospital, İstanbul, Turkey


Department of Urology, İzmir Tepecik Training and Research Hospital, İzmir, Turkey


Department of Urology University of Wisconsin School of Medicine and Public Health, Wisconsin, USA

Turk J Urol 1; 1: -
DOI: 10.5152/tud.2018.35305
Read: 87 Published: 15 October 2019

Objective: We validated the Turkish version of the Wisconsin Stone-Quality of Life (WISQoL) questionnaire for male and female patients with kidney stones.

Material and methods: The Turkish version of the WISQoL questionnaire was developed following a wellestablished multistep process. A total of 84 patients with kidney stones completed the Turkish WISQoL questionnaire, including the other validated questionnaires as The Short Form Health Survey (SF-36 v2) and Beck's
Depression Inventory. Patients completed questionnaires before percutaneous nephrolithotomy (PNL) surgery
as well as 2–4 weeks after surgery. Reliability was evaluated by internal consistency (tested by Cronbach’s alfa)
and test-retest reliability between week 2 and 4 (tested by Spearman correlation). Domain structures were examined by interdomain correlations using Spearman correlation coefficient. Convergent validity was assessed by
correlating the scores of general health domain to the SF-36 v2, and the scores of emotional impact domain to
the Beck's Depression Inventory questionnaire. Sensitivity to change was assessed by comparing scores before
and after PNL surgery with the Wilcoxon signed rank test. Discriminant validity was evaluated by comparing
the results of patients 2 and 4 weeks after surgery with Wilcoxon-rank sum tests.

Results: The Turkish version of the WISQoL demonstrates good internal consistency (Cronbach’s α=0.72-
0.78) and test–retest reliability (p>0.05). Inter-domain associations within the WISQOL showed a substantial correlation between various WISQoL domains, indicating a high conceptual relationship between the
domains. Also, the Turkish version of the WISQoL showed convergent validity with the corresponding
validated questionnaires (Spearman’s rho correlation coefficient=0.44-0.78). All domains of the WISQoL
showed significant sensitivity to change (p≤0.001).

Conclusion: The Turkish version of the WISQoL is a generally reliable instrument that can be self-administered by Turkish patients with kidney stones in clinical and research settings. Further clinical studies in
Turkish settings would be useful to provide powerful data on sensitivity to change.

Cite this article as: Atalay HA, Ülker V, Canat L, Özer M, Can O, Penniston KL. Validation of the Turkish version of the Wisconsin stonequality of life questionnaire. Turk J Urol 2017; 44: DOI: 10.5152/tud.2018.35305.

ISSN2149-3235 EISSN 2149-3057