title: Translation, adaptation and validation of a Portuguese version of the Moorehead-Ardelt Quality of Life Questionnaire II.
abstract: The prevalence of obesity has increased worldwide. An assessment of the impact of obesity on health-related quality of life (HRQoL) requires specific instruments. The Moorehead-Ardelt Quality of Life Questionnaire II (MA-II) is a widely used instrument to assess HRQoL in morbidly obese patients. The objective of this study was to translate and validate a Portuguese version of the MA-II.The study included forward and backward translations of the original MA-II. The reliability of the Portuguese MA-II was estimated using the internal consistency and test-retest methods. For validation purposes, the Spearman's rank correlation coefficient was used to evaluate the correlation between the Portuguese MA-II and the Portuguese versions of two other questionnaires, the 36-item Short Form Health Survey (SF-36) and the Impact of Weight on Quality of Life-Lite (IWQOL-Lite).One hundred and fifty morbidly obese patients were randomly assigned to test the reliability and validity of the Portuguese MA-II. Good internal consistency was demonstrated by a Cronbach's alpha coefficient of 0.80, and a very good agreement in terms of test-retest reliability was recorded, with an overall intraclass correlation coefficient (ICC) of 0.88. The total sums of MA-II scores and each item of MA-II were significantly correlated with all domains of SF-36 and IWQOL-Lite. A statistically significant negative correlation was found between the MA-II total score and BMI. Moreover, age, gender and surgical status were independent predictors of MA-II total score.A reliable and valid Portuguese version of the MA-II was produced, thus enabling the routine use of MA-II in the morbidly obese Portuguese population.
authors.affiliation: Department of General Surgery, Hospital do Espírito Santo de Évora, Largo Senhor da Pobreza, 7000-811, Évora, Portugal, joaomrpmaciel@gmail.com.
authors.forename: João
authors.initials: J
authors.lastname: Maciel
authors.forename: Paulo
authors.initials: P
authors.lastname: Infante
authors.forename: Susana
authors.initials: S
authors.lastname: Ribeiro
authors.forename: André
authors.initials: A
authors.lastname: Ferreira
authors.forename: Artur C
authors.initials: AC
authors.lastname: Silva
authors.forename: Jorge
authors.initials: J
authors.lastname: Caravana
authors.forename: Manuel G
authors.initials: MG
authors.lastname: Carvalho
mesh_terms: D000328:Adult; D000368:Aged; D050110:Bariatric Surgery / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009767:Obesity, Morbid / Q000523:psychology / Q000601:surgery*; D011174:Portugal; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014177:Translations