Development of a Brazilian Portuguese version of the Oswestry Disability Index: cross-cultural adaptation, reliability, and validity.
METHODS
Translation, revision, back-translation, and 3-way validity were performed.


OBJECTIVE
The objective of this study was to translate a version of the Oswestry Disability Index (ODI) into Brazilian Portuguese and evaluate its reliability.


BACKGROUND
Reports in the literature have identified a need for internationally standardized and reliable measurements to analyze back pain. The ODI has become one of the principal outcome measurements used in the management of spinal disorders.


METHODS
The cross-cultural adaptation was performed according to the internationally recommended methodology, using the following guidelines: translation, back-translation; revision by a committee, and pretesting. The psychometric properties were evaluated by administering the questionnaire to 120 subjects with back pain. Reliability was estimated through stability and homogeneity assessment. The validity was tested comparing ODI scores with the following measurements: Roland-Morris Disability Questionnaire, SF-36, and a Numerical Pain Scale.


RESULTS
Good internal consistency was found (Cronbach's alpha = 0.87). Intraclass correlation coefficient for test-retest reliability was 0.99. The ODI showed moderate correlation with pain measurement (r = 0.66). Relatively high correlation was also found between the ODI and the Roland-Morris scores (r = 0.81). There was significant correlation (P < 0.001) between ODI scores and the 8 scales of the SF-36.


CONCLUSIONS
The data showed that the cultural adaptation process was successful and that the adapted instrument demonstrated having excellent psychometric properties, reliable in the Brazilian culture.
Vigatto
Ricardo
R
Department of Nursing, Faculty of Medical Sciences, State University of Campinas, Campinas, SP, Brazil.
Alexandre
Neusa Maria Costa
NM
Correa Filho
Heleno Rodrigues
HR
D000328:Adult; D001938:Brazil / Q000208:ethnology; D003431:Cross-Cultural Comparison; D004185:Disability Evaluation; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D007802:Language; D017116:Low Back Pain / Q000208:ethnology / Q000503:physiopathology* / Q000523:psychology*; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement / Q000379:methods; D011594:Psychometrics; D015203:Reproducibility of Results; D012649:Self Concept