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Obesity Surgery

, Volume 19, Issue 10, pp 1393–1400 | Cite as

Validation of the Spanish Translation of the Questionnaire for the Obesity-Related Problems Scale

  • Amaia BilbaoEmail author
  • Javier Mar
  • Blanca Mar
  • Arantzazu Arrospide
  • Gabriel Martínez de Aragón
  • José María Quintana
Research Article

Abstract

Background

The objective of the study was to translate and validate the questionnaire for the Obesity-Related Problems Scale (OP) in the Spanish language.

Methods

The translation–retranslation procedure and a pilot study were first conducted. Then, patients with morbid obesity who were on a waiting list to undergo bariatric surgery were selected. The construct validity of the OP scale was studied by means of exploratory and confirmatory factor analyses. Item convergent and divergent validity were examined. The internal consistency of the OP scale, floor and ceiling effects, concurrent validity, and known-group validation were also examined. The Short Form 36 and EuroQol-5D questionnaires were used to evaluate the concurrent validity.

Results

A total of 123 individuals took part in the field study. Factor analyses and the item convergent and divergent validity confirmed the homogeneity of the construct. The Cronbach’s alpha coefficient was high (0.93), and floor and ceiling effects were small. Regarding the OP scale concurrent validity, the majority exceeded the correlation coefficient of 0.40, and all correlation coefficients were lower than the internal consistency of the OP scale. In relation to the known-group validation, significant differences were found in the OP mean scale according to body mass index (BMI) and age. Those patients with a higher BMI and younger patients reported more obesity-related problems.

Conclusion

These results confirm that this version of the OP scale has been translated and adapted correctly for the Spanish language and that it fulfils the psychometric properties required for these instruments.

Keywords

Obesity Quality of life Questionnaires OP scale Psychosocial functioning Validity Reliability Psychometric properties 

Notes

Acknowledgements

We thank J. Karlsson for assisting in the translation process. We would like to thank all patients for their collaboration. We also would like to acknowledge the editorial assistance provided by Sally Ebeling.

Conflict of interest

No conflicting relationship exists for any author.

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Copyright information

© Springer Science + Business Media, LLC 2009

Authors and Affiliations

  • Amaia Bilbao
    • 1
    • 7
    Email author
  • Javier Mar
    • 2
    • 3
  • Blanca Mar
    • 4
  • Arantzazu Arrospide
    • 2
  • Gabriel Martínez de Aragón
    • 5
  • José María Quintana
    • 6
  1. 1.Basque Foundation for Health Innovation and Research (BIOEF)–CIBER Epidemiología y Salud Pública (CIBERESP)SondikaSpain
  2. 2.Research Unit‘Alto Deba’ HospitalMondragónSpain
  3. 3.Clinical Management Unit‘Alto Deba’ HospitalMondragónSpain
  4. 4.Surgery Department‘Donostia’ HospitalDonostia-San SebastiánSpain
  5. 5.Surgery Department‘Txagorritxu’ HospitalVitoria-GasteizSpain
  6. 6.Research Unit‘Galdakao-Usansolo’ Hospital–CIBER Epidemiología y Salud Pública (CIBERESP)GaldakaoSpain
  7. 7.Fundación Vasca de Innovación e Investigación Sanitarias (BIOEF)SondikaSpain

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