title: Epidemiological aspects of recruitment of male volunteers for non-invasive urodynamics.
abstract: BACKGROUND
  We studied epidemiological aspects of recruitment of volunteers for a non-invasive urodynamic study.
  
  
  METHODS
  9,236 volunteers were invited by 20 general practitioners (GPs), using two different recruitment methods, i.e. by mail only, or during a subsequent visit to the GP's office. Factors influencing the response rates were analyzed. We also tested how much the recruited population of volunteers differed from the general population, by comparing it to another, proven representative study carried out earlier in 1,662 subjects.
  
  
  RESULTS
  In the recruited population the prostate volumes were not significantly different from the proven representative study, but the symptom score was statistically significantly higher, although the difference was so small it may be called clinically irrelevant. Recruitment of volunteers in two steps, i.e. asking them first to visit the GP's office, and inviting them there to visit the outpatient clinic, rather than directly inviting them (in writing) to the clinic seemed to lead to a higher response, although this effect could not be statistically discriminated from the difference in response rates between GPs.
  
  
  CONCLUSIONS
  The population recruited was not urologically different from the general population. The response depended on age, being highest around the age of 60, and increased with social economic status. It also depended on the GP who recruited the subjects, and/or on the recruitment method.
authors.affiliation: Department of Urology, Sector Furore, Erasmus MC, Rotterdam, The Netherlands.
authors.forename: V
authors.initials: V
authors.lastname: Avagyan
authors.forename: R
authors.initials: R
authors.lastname: van Mastrigt
authors.forename: J W N C
authors.initials: JW
authors.lastname: Huang Foen Chung
authors.forename: A M
authors.initials: AM
authors.lastname: Bohnen
authors.forename: J L H R
authors.initials: JL
authors.lastname: Bosch
authors.forename: P G H
authors.initials: PG
authors.lastname: Mulder
mesh_terms: D000328:Adult; D000368:Aged; D003950:Diagnostic Techniques, Urological; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D018579:Patient Selection; D001743:Urinary Bladder / Q000502:physiology*; D014563:Urodynamics