title: [Cultural adaptation and psychometric validation of the health-related quality of life questionnaire EORTC QLQ STO-22 for patients with gastric cancer in Peru].
abstract: OBJECTIVE
  To validate the health-related quality of life questionnaire EORTC QLQ STO-22 for patients with gastric cancer in Peru, evaluating cultural and psychometric characteristics.
  
  
  METHODS
  The first phase consisted in measure the content and appearance validity. In the second phase, the questionnaire was applied to patients diagnosed with gastric cancer and the internal consistency, test-retest reliability, convergent validity, discriminant validity and criterion validity was determined.
  
  
  RESULTS
  After performing the content and appearance validity the questions/items 31 and 39 were changed. The global Cronbach's Î± was 0.90 and Î± coefficients greater than 0.7 in the multi-item subscales was obtained. The test-retest reliability showed an overall correlation of 0.924. When analyzing the convergent and discriminant validity, the values of Pearson's "r" were higher between an item and its own subscale, than the same item with other multi-item sub-scales. The criterion validity of the EORTC QLQ STO-22 compared with the EORTC QLQ C-30 showed a positive correlation of 0.727 with items evaluating symptomatology, and a negative correlation of -0.587 when comparing with functional status items, both statistically significant.
  
  
  CONCLUSIONS
  The modified questionnaire EORTC QLQ STO-22 meets the reliability and validity criteria for assessing the quality of life in patients with gastric cancer in Peru.
authors.affiliation: Facultad de Medicina, Universidad Peruana Cayetano Heredia. Lima, Perú.
authors.forename: Jorge Marko
authors.initials: JM
authors.lastname: Soria Moncada
authors.affiliation: Facultad de Medicina, Universidad Peruana Cayetano Heredia. Lima, Perú.
authors.forename: Juan Gerardo
authors.initials: JG
authors.lastname: Carrasco Lozano
authors.affiliation: Facultad de Medicina, Universidad Peruana Cayetano Heredia. Lima, Perú.
authors.forename: César
authors.initials: C
authors.lastname: Loza Munarriz
authors.affiliation: Departamento de Abdomen del Instituto Nacional de Enfermedades Neoplásicas. Lima, Perú.
authors.forename: Eloy
authors.initials: E
authors.lastname: Ruiz Figueroa
authors.affiliation: Facultad de Medicina, Universidad Peruana Cayetano Heredia. Lima, Perú; Departamento de Abdomen del Instituto Nacional de Enfermedades Neoplásicas. Lima, Perú.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Payet Meza
mesh_terms: D000230:Adenocarcinoma; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D065246:Culturally Competent Care; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D010568:Peru; D011446:Prospective Studies; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D013274:Stomach Neoplasms; D011795:Surveys and Questionnaires; D014177:Translations