Brazilian version of airways questionnaire 20: a reproducibility study and correlations in patients with COPD

• Published in: Respiratory medicine 2005-05, Vol.99 (5), p.602-608
• Main Authors: Camelier, Aquiles, Rosa, Fernanda W., Jones, Paul W., Jardim, Jose R.
• Format: Article
• Language: English
• Subjects: Aged; Analysis of Variance; Biological and medical sciences; Brazil; COPD; Female; Health Status; Humans; Lung - physiopathology; Male; Medical sciences; Middle Aged; Observer Variation; Patient Compliance; Pneumology; Pulmonary Disease, Chronic Obstructive - physiopathology; Pulmonary Disease, Chronic Obstructive - psychology; Quality of Life; Regression Analysis; Respiratory Function Tests; Sensitivity and Specificity; Statistics; Surveys and Questionnaires; Validation
• ISSN: 0954-6111; 1532-3064
• DOI: 10.1016/j.rmed.2004.09.022

This study describes the correlations and reproducibility of AQ20, a simple health status questionnaire with 20 questions, which was designed to be useful especially in time sparing situations. A formal language validation process was done, in order to validate the AQ20 before studying its reproducibility. Thirty stable COPD patients answered the final version twice within 15 days. To test the reproducibility of AQ20, the interclass correlation coefficient and Bland–Altman display were used. Results were correlated with FEV 1, SpO 2, BMI, Mahler BDI, and the Saint George Respiratory Questionnaire (SGRQ). Twenty-five patients (83.3%) were male, with a mean age of 68.6 years. The mean predicted FEV 1 (%) was 56.8%. The interclass correlation ratio for the total score was α = 0.90 for the intraobserver variability and α = 0.93 for the interobserver variability. The correlation with total SGRQ score was 0.76, with P