title: Validation of brief pain inventory to Brazilian patients with pain.
abstract: OBJECTIVE
  To validate the Brazilian version of the Brief Pain Inventory (BPI-B) scale and to determine the optimal cutpoints for mild, moderate, and severe pain based on patients' rating of their worst pain.
  
  
  METHODS
  One hundred forty-three outpatients with cancer were recruited in Hospital das Clinicas-University of Sao Paulo, Brazil.
  
  
  RESULTS
  Confirmatory factor analysis confirmed two underlying dimensions, pain severity, and pain interference, with Cronbach's α of 0.91 and 0.87, respectively. Convergent validity was shown by the correlation observed between the BPI dimensions with the EORTC-QLQ-C30 pain scale and the McGill Pain Questionnaire. The BPI-B detected significant differences in the two dimensions by disease and performance status, supporting known-group validity. For the worst pain, the optimal cutpoints were 4 and 7 (1-4 = mild pain, 5-7 = moderate, and 8-10 = severe).
  
  
  CONCLUSIONS
  Our data show that BPI-B is a brief, useful, and valid tool for assessing pain and its impact on patient's life.
authors.affiliation: Instituto do Cancer do Estado de Sao Paulo-ICESP, University of Guarulhos-UnG, Butanta, Sao Paulo, SP, Brazil. karryi@hotmail.com
authors.forename: Karine A
authors.initials: KA
authors.lastname: Ferreira
authors.forename: Manoel Jacobsen
authors.initials: MJ
authors.lastname: Teixeira
authors.forename: Tito R
authors.initials: TR
authors.lastname: Mendonza
authors.forename: Charles S
authors.initials: CS
authors.lastname: Cleeland
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications*; D010045:Outpatients; D010146:Pain / Q000175:diagnosis* / Q000209:etiology; D010147:Pain Measurement / Q000379:methods*; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires