Translation and validation study of the Iranian version of Seattle Angina Questionnaire

Objective (s): To translate and evaluate the validity and reliability of the Seattle Angina Questionnaire, as a disease-specific quality of life scale in patients with angina pectoris. After permission, the questionnaire was translated. Then face validity, content validity, concurrent validity and criterion validity were determined. In order to evaluate the construct validity, known-groups comparison (patients with and without chest symptoms) was performed and to determine its criterion validity the Short Form 36 (SF-36) was used. Cronbach's alpha coefficients and the test retest were used to assess the scale reliability. 100 patients with angina pectoris participated in this study. The criterion validity showed high and significant correlation between most SAQ and SF-36 scores. Cronbach’s alpha of the total scale was 0.85 and test-retest reliability (ICC) within 2 weeks, in all dimensions was greater than 0. 90. The findings suggest that the SAQ is a valid and reliable disease-specific scale and can be considered for measuring health outcomes in research and clinical settings