title: Psychometric properties of the Brief Symptom Inventory-18 in a Spanish breast cancer sample.
abstract: OBJECTIVE
  The objective of this work was to study the psychometric and structural properties of the Brief Symptom Inventory-18 (BSI-18) in a sample of breast cancer patients (N=175).
  
  
  METHODS
  Confirmatory factor analyses were conducted. Two models were tested: the theoretical model with the original structure (three-dimensional), and the empirical model (a four-factor structure) obtained through exploratory factor analysis initially performed by the authors of the BSI-18.
  
  
  RESULTS
  The eligible structure was the original proposal consisting of three dimensions: somatization, depression, and anxiety scores. These measures also showed good internal consistency.
  
  
  CONCLUSIONS
  The results of this study support the reliability and structural validity of the BSI-18 as a standardized instrument for screening purposes in breast cancer patients, with the added benefits of simplicity and ease of application.
authors.affiliation: Department of Personality, Assessment, and Psychological Treatments, University of Valencia, Valencia, Spain.
authors.forename: Ma José
authors.initials: MJ
authors.lastname: Galdón
authors.forename: Estrella
authors.initials: E
authors.lastname: Durá
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Andreu
authors.forename: Maite
authors.initials: M
authors.lastname: Ferrando
authors.forename: Sergio
authors.initials: S
authors.lastname: Murgui
authors.forename: Sandra
authors.initials: S
authors.lastname: Pérez
authors.forename: Elena
authors.initials: E
authors.lastname: Ibañez
mesh_terms: D000223:Adaptation, Psychological; D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000523:psychology*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008875:Middle Aged; D010555:Personality Inventory / Q000706:statistics & numerical data*; D011594:Psychometrics; D015203:Reproducibility of Results; D013030:Spain / Q000208:ethnology; D013315:Stress, Psychological / Q000175:diagnosis* / Q000523:psychology; D011795:Surveys and Questionnaires; D044465:White People / Q000523:psychology / Q000706:statistics & numerical data*