Title. Psychometric properties of MacNew Heart Disease Health-related Quality of Life Questionnaire: Brazilian version.
Aim. This paper is a report of a study to test the psychometric properties of the Brazilian Version of the MacNew Heart Disease Health-related Quality of Life Questionnaire.
Background. Evidence of acceptable psychometric properties of the original MacNew questionnaire has been reported. However, the psychometric performance of the Brazilian version has not been extensively studied.
Method. Between November 2004 and June 2005, 159 patients with myocardial infarction completed the Brazilian version of the instrument. Reliability was determined with Cronbach’s alpha coefficient; convergent validity with Pearson’s correlation between the Brazilian MacNew questionnaire and the SF-36; and the ‘known-group’ approach was used to test discriminant validity. Ceiling and floor effects and practicality were analyzed.
Findings. It took an average of 8·9 minutes to complete the instrument. A ceiling effect was detected in the subscales and global scores, with no floor effect. Cronbach’s alpha coefficient ranged from 0·87 to 0·92. Scores on similar domains of the SF-36 and the MacNew questionnaire were correlated (r = 0·66; 0·78 and 0·53 for the physical, emotional, and social domains). Correlation between the dissimilar SF-36 mental health and MacNew physical domains was lower at 0·45; correlation between the dissimilar SF-36 physical functioning and MacNew emotional domain was 0·64. Individuals without regional ventricular dysfunction or symptoms had statistically significantly higher scores than those with regional ventricular dysfunction or symptoms.
Conclusion. The Brazilian version of the MacNew questionnaire has acceptable levels of validity, reliability and practicality. Further studies are advisable to confirm its divergent validity and to test its responsiveness.