title: Convenience voids: an important new factor in urinary frequency volume chart analysis.
abstract: OBJECTIVE
  We assessed the impact of convenience voids (CVs) on urinary frequency volume chart (FVC) analysis.
  
  
  METHODS
  A total of 53 healthy volunteers completed a FVC for 1 week, highlighting as CVs samples when there was no sensation of bladder fullness, but rather a social reason to pass urine instead.
  
  
  RESULTS
  Of the volunteers 72% had at least 1 CV during the week. Removing the CVs from analysis resulted in an increase of 17 ml in average mean individual voided volume from 308 to 325 ml (p <0.001). The average mean interval between voids increased by 11 minutes from 4 hours 34 minutes to 4 hours 45 minutes (p <0.001).
  
  
  CONCLUSIONS
  Convenience voids have a small but significant effect on parameters analyzed on FVCs. They should be considered for inclusion in the FVCs used in research when changes in voided volume are being investigated.
authors.affiliation: Department of Urology, Blackburn Royal Infirmary, Blackburn, Lancashire, United Kingdom.
authors.forename: Richard
authors.initials: R
authors.lastname: Darling
authors.forename: Donald
authors.initials: D
authors.lastname: Neilson
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011996:Records; D012016:Reference Values; D014554:Urination; D014556:Urine