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BACKGROUND: The assessment of patients with chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) in everyday practice and clinical studies relies on National Institutes of Health Chronic Prostatitis Symptom Index (NIH-CPSI) scores for symptom appraisal, inclusion criteria for clinical trials, follow-up, and response evaluation. OBJECTIVE: We investigated multiple databases of CP/CPPS patients to determine the prevalence and impact of pain locations and types to improve our strategy of individualized phenotypically guided treatment. DESIGN, SETTING, AND PARTICIPANTS: Four major databases with CPSI scores for nonselected CP/CPPS clinic patients from Canada, Germany, Italy, and the United States. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Individual question scores and subtotal and total scores of CPSI were described and correlated with each other. Ordinal regression …