title: The EORTC Quality of Life Questionnaire for patients with prostate cancer: EORTC QLQ-PR25. Validation study for Spanish patients.
abstract: OBJECTIVE
  The EORTC Quality of Life (QL) Group has developed a questionnaire, the EORTC QLQ-PR25, for evaluating QL in prostate cancer. The aim of this study is to assess the psychometric properties of the EORTC QLQPR25 when applied to a sample of Spanish patients.
  
  
  METHODS
  One hundred and thirty-seven prostate cancer patients with localised disease who started radiotherapy with radical intention combined with or without hormonotherapy prospectively completed the EORTC QLQ-C30 and EORTC QLQ-PR25 questionnaires three times: on the first and last day of radiotherapy and in the follow-up period. Psychometric evaluation of the questionnaires' structure, reliability and validity was conducted.
  
  
  RESULTS
  Multitrait scaling analysis showed that many of the item-scale correlation coefficients met the standards of convergent and discriminant validity. Exceptions appeared mainly in the scales for bowel symptoms and for hormonal- treatment-related symptoms. Cronbach's coefficients of the scales were good (0.72-0.86) for the urinary symptoms and sexual function scales but they were lower (<0.70) for the bowel and hormonal treatment scales. Most scales of the EORTC QLQ-PR25 had low to moderate intercorrelations. Correlations between the scales of the QLQ-C30 and the module were generally low. Group comparison analyses showed better QL in patients with higher Performance Status. Changes in QL appeared throughout the measurements. These were in line with the treatment process.
  
  
  CONCLUSIONS
  The EORTC QLQ-PR25 was a reliable and valid instrument when applied to a sample of Spanish prostate cancer patients. These results are in line with those of the EORTC validation study.
authors.affiliation: Radiotherapeutic Oncology Department, Hospital of Navarre, Pamplona, Navarra, Spain. jiarraras@correo.cop.es
authors.forename: J I
authors.initials: JI
authors.lastname: Arraras
authors.forename: E
authors.initials: E
authors.lastname: Villafranca
authors.forename: F
authors.initials: F
authors.lastname: Arias de la Vega
authors.forename: P
authors.initials: P
authors.lastname: Romero
authors.forename: M
authors.initials: M
authors.lastname: Rico
authors.forename: M
authors.initials: M
authors.lastname: Vila
authors.forename: G
authors.initials: G
authors.lastname: Asín
authors.forename: V
authors.initials: V
authors.lastname: Chicata
authors.forename: M A
authors.initials: MA
authors.lastname: Domínguez
authors.forename: N
authors.initials: N
authors.lastname: Lainez
authors.forename: A
authors.initials: A
authors.lastname: Manterola
authors.forename: E
authors.initials: E
authors.lastname: Martínez
authors.forename: M
authors.initials: M
authors.lastname: Martínez
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000523:psychology*; D011594:Psychometrics; D011788:Quality of Life; D011795:Surveys and Questionnaires