title: [Comparison of the response to I-PSS according to the mode of administration of the questionnaire: by the doctor or self-assessment by the patient].
abstract: OBJECTIVE
  To compare the response to I-PSS according to its mode of administration (by the doctor versus self-assessment).
  
  
  METHODS
  388 patients were included during the 3 months following a diagnosis of benign prostatic hyperplasia. The general practitioner completed the I-PSS and gave an I-PSS questionnaire to the patient to be completed at home and returned in a reply-paid envelope to the data entry centre. The Bland & Altman method was used to visualize individual differences and to quantify the bias between the two modes of evaluation.
  
  
  RESULTS
  The doctor overestimated the I-PSS by an average of 1.3 points [95% CI: 0.9-1.7]. In 42% of patients, these individual differences were 3 points or more. Significant overestimation was confirmed at 6, 12 and 18 months of follow-up.
  
  
  CONCLUSIONS
  A significant bias was demonstrated according to the mode of administration of the I-PSS. We therefore recommend that the same mode of administration should be maintained during clinical trials.
authors.affiliation: Service d'Urologie, Hôpital Lyon Sud, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Ruffion
authors.forename: Nathalie
authors.initials: N
authors.lastname: Marionneau
authors.forename: Charles
authors.initials: C
authors.lastname: Taïeb
authors.forename: Paul
authors.initials: P
authors.lastname: Perrin
mesh_terms: D003625:Data Collection / Q000379:methods; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D011446:Prospective Studies; D011470:Prostatic Hyperplasia / Q000175:diagnosis*; D011795:Surveys and Questionnaires