No AccessJournal of UrologyClinical Urology: Original Articles1 Aug 1999THE NATIONAL INSTITUTES OF HEALTH CHRONIC PROSTATITIS SYMPTOM INDEX: DEVELOPMENT AND VALIDATION OF A NEW OUTCOME MEASURE MARK S. LITWIN, MARY McNAUGHTON-COLLINS, FLOYD J. FOWLER, J. CURTIS NICKEL, ELIZABETH A. CALHOUN, MICHEL A. PONTARI, RICHARD B. ALEXANDER, JOHN T. FARRAR, and MICHAEL P. O'LEARY MARK S. LITWINMARK S. LITWIN More articles by this author , MARY McNAUGHTON-COLLINSMARY McNAUGHTON-COLLINS More articles by this author , FLOYD J. FOWLERFLOYD J. FOWLER More articles by this author , J. CURTIS NICKELJ. CURTIS NICKEL More articles by this author , ELIZABETH A. CALHOUNELIZABETH A. CALHOUN More articles by this author , MICHEL A. PONTARIMICHEL A. PONTARI More articles by this author , RICHARD B. ALEXANDERRICHARD B. ALEXANDER More articles by this author , JOHN T. FARRARJOHN T. FARRAR More articles by this author , and MICHAEL P. O'LEARYMICHAEL P. O'LEARY More articles by this author View All Author Informationhttps://doi.org/10.1016/S0022-5347(05)68562-XAboutFull TextPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract Purpose: Chronic abacterial prostatitis is a syndrome characterized by pelvic pain and voiding symptoms, which is poorly defined, poorly understood, poorly treated and bothersome. Research and clinical efforts to help men with this syndrome have been hampered by the absence of a widely accepted, reliable and valid instrument to measure symptoms and quality of life impact. We developed a psychometrically valid index of symptoms and quality of life impact for men with chronic prostatitis. Materials and Methods: We conducted a structured literature review of previous work to provide a foundation for the new instrument. We then conducted a series of focus groups comprising chronic prostatitis patients at 4 centers in North America, in which we identified the most important symptoms and effects of the condition. The results were used to create an initial draft of 55 questions that were used for formal cognitive testing on chronic prostatitis patients at the same centers. After expert panel review formal validation testing of a revised 21-item draft was performed in a diverse group of chronic prostatitis patients and 2 control groups of benign prostatic hyperplasia patients and healthy men. Based on this validation study, the index was finalized. Results: Analysis yielded an index of 9 items that address 3 different aspects of the chronic prostatitis experience. The primary component was pain, which we captured in 4 items focused on location, severity and frequency. Urinary function, another important component of symptoms, was captured in 2 items (1 irritative and 1 obstructive). Quality of life impact was captured with 3 items about the effect of symptoms on daily activities. The 9 items had high test-retest reliability (r = 0.83 to 0.93) and internal consistency (alpha = 0.86 to 0.91). All but the urinary items discriminated well between men with and without chronic prostatitis. Conclusions: The National Institutes of Health chronic prostatitis symptom index provides a valid outcome measure for men with chronic prostatitis. The index is psychometrically robust, easily self-administered and highly discriminative. It was formally developed and psychometrically validated, and may be useful in clinical practice as well as research protocols. References 1 : Prevalence of bothersome genitourinary symptoms and diagnosis in younger men on routine primary care visits. Urology1998; 52: 422. Google Scholar 2 : How common is prostatitis? A national survey of physician visits. J. Urol.1998; 159: 1224. 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Google Scholar From the Departments of Urology and Health Services, University of California, Los Angeles, Los Angeles, California, General Medicine Unit, Massachusetts General Hospital, Center for Survey Research, University of Massachusetts, Division of Urologic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, Department of Urology, Queen's University, Kingston, Canada, Institute of Health Services Research and Health Policy Studies, and Department of Urology, Northwestern University Medical School, Chicago, Illinois, Department of Urology, Temple University School of Medicine, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania, and Department of Surgery, University of Maryland School of Medicine, Baltimore, MarylandAccepted for publication March 5, 1999.Supported by Grants R01DK53738, R01DK53736, R01DK53746, R01DK53730, R01DK53734, R01DK53732 and R01DK53752 from the National Institute of Diabetes and Digestive and Kidney Diseases.(Farrar) Financial interest and/or other relationship with Parke Davis, Anesta, Abbott and Smith Kline Beechum.The Chronic Prostatitis Collaborative Research Network; Sponsored by the National Institute of Diabetes and Digestive and Kidney Diseases. Principal investigators: Richard B. Alexander, J. Richard Landis, Mark S. Litwin, J. Curtis Nickel, Michael P. O'Leary, Michael A. Pontari and Anthony J. Schaeffer. Co-investigators: Michael J. Barry, Charles L. Bennett, Wade Bushman, Elizabeth A. Calhoun, Howard Ceri, Denise Cifelli, James Duncan, John T. Farrar, Harold I. Feldman, Floyd J. Fowler, Jr., Duncan Hunter, Keith Jarvi, John Kusek, Mary McNaughton-Collins, Robert B. Nadler, Leroy M. Nyberg, Sathibalan Ponniah, Kathleen J. Propert, Michael R. Ruggieri and Daniel A. 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Volume 162Issue 2August 1999Page: 369-375 Advertisement Copyright & Permissions© 1999 by American Urological Association, Inc.MetricsAuthor Information MARK S. LITWIN More articles by this author MARY McNAUGHTON-COLLINS More articles by this author FLOYD J. FOWLER More articles by this author J. CURTIS NICKEL More articles by this author ELIZABETH A. CALHOUN More articles by this author MICHEL A. PONTARI More articles by this author RICHARD B. ALEXANDER More articles by this author JOHN T. FARRAR More articles by this author MICHAEL P. O'LEARY More articles by this author Expand All Advertisement PDF downloadLoading ...