Blayne Welk1, Sara Lenherr2, Sean Elliott3, John Stoffel4, Angela P Presson5, Chong Zhang5, Jeremy B Myers2. 1. Department of Surgery and Epidemiology & Biostatistics, Western University, London, ON, Canada. blayne.welk@sjhc.london.on.ca. 2. Department of Surgery, Division of Urology, University of Utah, Salt Lake City, UT, USA. 3. Department of Surgery, University of Minnesota, Minneapolis, MN, USA. 4. Department of Surgery, University of Michigan, Ann Arbor, MI, USA. 5. Department of Epidemiology, Department of Internal Medicine, University of Utah Health Care, Salt Lake City, Utah, USA.
Abstract
STUDY DESIGN: Prospective cross-sectional study. OBJECTIVES: Validate the Neurogenic Bladder Symptom Score (NBSS) for people with spinal cord injury (SCI). SETTING: United States (recruitment from community/tertiary neurourology clinics). METHODS: We used data from a prospective observational study of people with a SCI who enrolled during December 2015-September 2016. Participants completed the NBSS and other measurement tools (SF-12 and SCI-QOL Bladder Management Complications tool). Data were used to determine the internal consistency (Cronbach's alpha), validity (hypothesis testing), and test-re-test reliability (using an intraclass correlation coefficient). RESULTS: 609 people with a SCI had complete data. The median NBSS total score was 22 (IQR 15-30), and median quality of life was "mixed". The Cronbach's alpha of the total and the incontinence, storage/voiding, and consequences domains was 0.85, 0.93, 0.76, and 0.49 respectively. All item to domain correlations were ≥0.3, aside from 3/7 of the items from the consequences domain. Appropriate correlations between the NBSS domains and external variables and other questionnaires were observed, such as a moderate correlation between the SCI-QOL Bladder Management complications tool and the NBSS total score. For the reliability assessment, 174 people had 3 month followup data and did not have a significant change to their urologic health. The intraclass correlation coefficients were >0.75 for all subdomains and the overall score. CONCLUSIONS: The NBSS demonstrated good validity and reliability in a large cohort of people with a SCI, and is a suitable tool to assess neurogenic bladder symptoms. SPONSORSHIP: Patient-Centered Outcomes Research Institute (PCORI) Award CER14092138.
STUDY DESIGN: Prospective cross-sectional study. OBJECTIVES: Validate the Neurogenic Bladder Symptom Score (NBSS) for people with spinal cord injury (SCI). SETTING: United States (recruitment from community/tertiary neurourology clinics). METHODS: We used data from a prospective observational study of people with a SCI who enrolled during December 2015-September 2016. Participants completed the NBSS and other measurement tools (SF-12 and SCI-QOL Bladder Management Complications tool). Data were used to determine the internal consistency (Cronbach's alpha), validity (hypothesis testing), and test-re-test reliability (using an intraclass correlation coefficient). RESULTS: 609 people with a SCI had complete data. The median NBSS total score was 22 (IQR 15-30), and median quality of life was "mixed". The Cronbach's alpha of the total and the incontinence, storage/voiding, and consequences domains was 0.85, 0.93, 0.76, and 0.49 respectively. All item to domain correlations were ≥0.3, aside from 3/7 of the items from the consequences domain. Appropriate correlations between the NBSS domains and external variables and other questionnaires were observed, such as a moderate correlation between the SCI-QOL Bladder Management complications tool and the NBSS total score. For the reliability assessment, 174 people had 3 month followup data and did not have a significant change to their urologic health. The intraclass correlation coefficients were >0.75 for all subdomains and the overall score. CONCLUSIONS: The NBSS demonstrated good validity and reliability in a large cohort of people with a SCI, and is a suitable tool to assess neurogenic bladder symptoms. SPONSORSHIP: Patient-Centered Outcomes Research Institute (PCORI) Award CER14092138.
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