• Alper Coşkun, Utku Can, Fatih Tarhan, Övünç Kavukoğlu, and Kamil Fehmi Narter.
• Department of Urology, University of Health Sciences, Kartal Dr. Lütfi Kırdar Training and Research Hospital, İstanbul, Turkey
• Turk J Med Sci. 2021 Apr 30; 51 (2): 501-507.

Background/AimTo develop the first Turkish version of the National Institutes of Health Chronic Prostatitis Symptom Index (NIH- CPSI) questionnaire and to investigate its validity and reliability in men with chronic prostatitis/chronic pelvic pain syndrome (CP/ CPPS) and healthy controls.Material And MethodsA total of 204 patients, 116 CP/CPPS and a control group which consisted of 88 healthy individuals were included in this prospective study. The NIH-CPSI form was first translated into Turkish and later on back into English. Using the Turkish version of the NIH CPSI, 40 patients completed the same questionnaires twice at 2-week intervals for test-retest concordance. To evaluate internal consistency and test-retest reliability, Cronbach’s alpha value, and the Spearman correlation test were utilized respectively.ResultsOur findings demonstrated statistically significant differences in NIH-CPSI scores between the patients and control groups (P <0.001). Cronbach’s alpha coefficient value of NIH-CPSI was 0.864. Reliability of test-retest was 0.909 (P <0.001). Additionally, the Spearman correlation test showed that the results obtained using the Turkish NIH-CPSI were significantly correlated.ConclusionThe first Turkish version of the NIH-CPSI was found to be a reliable and valid instrument for Turkish patients with chronic prostatitis in both clinical and research settings.This work is licensed under a Creative Commons Attribution 4.0 International License.

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