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Reliability and validity of the National Institutes of Health Chronic Prostatitis Symptom Index questionnaire in the
Alper Coşkun1, Utku Can1, Fatih Tarhan1
1Department of Urology, University of Health Sciences, Kartal Dr. Lütfi Kırdar Training and Research Hospital, İstanbul, Turkey
Background/Aim:
To 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 Methods:
A 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.
Results:
Our 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.
Conclusion:
The 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.
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