title: The international prostate symptom score overestimates nocturia assessed by frequency-volume charts.
abstract: OBJECTIVE
  We analyzed differences in nocturia, as estimated by the International Prostate Symptom Score and 7-day frequency-volume charts.
  
  
  METHODS
  A total of 398 forms were collected from 500 consecutive urological outpatients willing to record a 7-day frequency-volume chart. All patients completed a general questionnaire, an International Prostate Symptom Score, and a bladder symptom and bother score. Missed recordings were indicated by a coded letter. Patients who lacked essential data, bedtimes or an International Prostate Symptom Score, or who recorded the frequency-volume chart for less than 5 days were excluded from study.
  
  
  RESULTS
  A total of 186 men and 115 women with a mean age of 56 years were evaluable. In 10.6% of patients no nocturia occurred. Of those with nocturia 70% and 34% experienced nocturia a mean of 1 or more and 2 or more times, respectively. In 43% of patients the International Prostate Symptom Score equaled calculated categorized nocturia while 50% had a higher International Prostate Symptom Score nocturia score than calculated nocturia. On univariate analysis the correlation of International Prostate Symptom Score question 7 with mean nocturia increased with frequency-volume chart duration (day 1 r = 0.52 to day 3 r = 0.63). On longer duration frequency-volume charts the correlation showed no further increase. Multivariate regression analysis revealed that the nocturia score was determined by mean nocturia in the frequency-volume chart, the nocturia bother score and patient age.
  
  
  CONCLUSIONS
  The International Prostate Symptom Score nocturia score overestimated nocturia in most patients, as derived from a 7-day frequency-volume chart. When scoring International Prostate Symptom Score nocturia question 7, patients included a degree of bother. The correlation of question 7 with mean nocturia increased with frequency-volume chart duration until day 3.
authors.affiliation: Department of Urology, Sint Lucas Andreas Ziekenhuis, Amsterdam, The Netherlands. e.vanhaarst@slaz.nl
authors.forename: Ernst P
authors.initials: EP
authors.lastname: van Haarst
authors.forename: J L H Ruud
authors.initials: JL
authors.lastname: Bosch
authors.forename: Eddi A
authors.initials: EA
authors.lastname: Heldeweg
mesh_terms: D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009426:Netherlands / Q000453:epidemiology; D053158:Nocturia / Q000453:epidemiology* / Q000209:etiology / Q000503:physiopathology; D011470:Prostatic Hyperplasia / Q000150:complications* / Q000503:physiopathology; D011788:Quality of Life; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D014554:Urination / Q000502:physiology*