Abstract
BackgroundAngina pectoris causes substantial psychological and functional disabilities and adversely effects quality of life in patients. The aim of this study was to investigate the psychometric properties including validity and reliability of the Farsi version of the Seattle angina questionnaire.MethodsThe ‘forward-backward’ procedure was applied to translate this questionnaire from English to Farsi. The translated version of the Seattle angina questionnaire was assessed in terms of validity and reliability with a convenience sample of 200 patients suffering from angina pectoris who were recruited from the inpatient ward (post CCU) and outpatient department at two teaching hospitals in an urban area of Iran. Validity was assessed using content, face and construct validity. The calculation of the Cronbach’s alpha coefficient and the test-retest method helped with the assessment of reliability of the questionnaire’s five subscales. Construct validity of the questionnaire was evaluated using exploratory factor analysis.ResultsThe results of exploratory factor analysis indicated a five-factor solution for the questionnaire including ‘physical limitation in middle to strenuous activities’, ‘physical limitation in slight activities’, ‘angina pattern and discomfort of treatment’, ‘treatment satisfaction’ and ‘disease perception’ that jointly accounted for 64.42% of variance observed. Convergent validity was mostly supported by the pattern of association between the Seattle angina questionnaire-Farsi version and the SF-36. Cronbach’s alpha of the subscales ranged from 0.60 to 0.86 and test-retest scores ranged from 0.79 to 0.97 indicating a good range of reliability.ConclusionsThe Seattle angina questionnaire-Farsi version had acceptable psychometric properties. Therefore, it can be used to assess health-related quality of life and assess the effects of different medical and nursing interventions on patients’ quality of life.
Highlights
Angina pectoris causes substantial psychological and functional disabilities and adversely effects quality of life in patients
The study findings revealed that quality of life (QoL) scores in asymptomatic patients in three dimensions of the Seattle angina questionnaire (SAQ)-F including ‘physical limitation in activities requiring lower levels of exertion’, ‘angina pattern and discomfort of treatment’, and ‘disease perception’ were significantly higher than the symptomatic patients
The study findings revealed that the Farsi version of SAQ (SAQ-F) had an acceptable internal consistency
Summary
Angina pectoris causes substantial psychological and functional disabilities and adversely effects quality of life in patients. Cardiovascular disease (CVD) is the leading cause of death and disability across the world [1, 2]. Monitoring QoL in patients with angina pectoris is very important [7]. Health-related QoL is a state in which patients feel emotionally, socially, and physically satisfied [8]. The evaluation of healthcare outcomes is a fundamental prerequisite for assessing he success of treatment modalities. Different general and disease-specific questionnaires have been developed to evaluate healthcare outcomes such as the patient’s QoL. Diseasespecific questionnaires measure healthcare outcomes that are related mainly to the course of the disease and its progression in specific patient populations [7, 10, 11]
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