Reliability and validity of Persian version of Chronic Stress Scale (CSS) among first degree relatives of patients with type II diabetes

The aim of this study was to examine reliability and validity of Persian version of Chronic Stress Scale (CSS) among a sample of first degree relatives of patients with type II diabetes. English version of CSS was transformed into a Persian questionnaire after translation and back-translation and then was used among 199 participants of the research. In order to explore test-retest reliability of CSS, 30 subjects answered the questions again, 8 to 11 weeks after first testing. Internal consistency of CSS in terms of alpha coefficient was obtained 0.87. Correlation coefficients between CSS and type D personality scale, neuroticism subscale of EPQ-RS, depression subscale of DAS, and anger and hostility subscale of SCL-90-R was obtained 0.36, 0.34, 0.38, and 0.30 respectively. Test-retest reliability with 8- to 11-week distance between two testing periods was 0.73. Based on results of our study, Persian version of CSS has the required psychometric properties for application in psychological studies on Iranian populations at risk of chronic diseases.