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Convenience voids: an important new factor in urinary frequency volume chart analysis.
Richard Darling1, Donald Neilson
1Department of Urology, Blackburn Royal Infirmary, Blackburn, Lancashire, United Kingdom.
The Journal of Urology
|January 12, 2005
Summary
Convenience voids (CVs), or urinating for social reasons, significantly alter urinary frequency volume chart (FVC) analysis. Excluding CVs provides a more accurate understanding of bladder voiding patterns in research.
Area of Science:
- Urology
- Clinical Research
Background:
- Urinary frequency volume charts (FVCs) are crucial for assessing lower urinary tract symptoms.
- The influence of non-symptomatic voids, termed convenience voids (CVs), on FVC data is not well understood.
Purpose of the Study:
- To evaluate the impact of convenience voids (CVs) on the analysis of urinary frequency volume charts (FVCs).
Main Methods:
- 53 healthy volunteers completed a 1-week FVC.
- Participants identified voids made for social reasons (CVs) rather than bladder fullness.
Main Results:
- 72% of volunteers experienced at least one CV during the study week.
- Excluding CVs increased mean voided volume by 17 ml (308 to 325 ml, p <0.001).
- The mean interval between voids increased by 11 minutes (4h 34m to 4h 45m, p <0.001) after CV removal.
Conclusions:
- Convenience voids have a statistically significant, though small, effect on FVC parameters.
- Researchers investigating changes in voided volume should consider excluding or accounting for CVs in their FVC analysis.