Translation and validation of the "Global Transformational Leadership scale" into Greek

OBJECTIVE The translation and cross-cultural adaptation of the "Global Transformational Leadership scale" into Greek. METHOD The original questionnaire was in English and the target version was in Greek. The process of translation into Greek was applied and then the translation of the Greek version into English, and finally the translation and cross-cultural adaptation process was checked. To test the reliability of the questionnaire, a test-retest study was conducted. Confirmatory factor analysis was performed to check validity. RESULTS The kappa indices in initial measurement and re-measurement for the seven questions of "Global Transformational Leadership scale" were found to have statistically significant relationships, indicating high reliability of the questionnaire. Furthermore, the high reliability of the questionnaire is also indicated by the fact that the intraclass correlation coefficient for the total score was extremely high and, more specifically, equal to 0.95 (95% confidence interval: 0.89 to 0.98, p<0.001). According to the results of the confirmatory factor analysis, the Greek version of the "Global Transformational Leadership scale" showed excellent fit, as all indicators had acceptable values. Moreover, the weighted regression weights had high values as they ranged from 0.74 to 0.89. Thus, it can be concluded that "Global Transformational Leadership scale" has high construct validity and is unidimensional. CONCLUSIONS The Greek version of the "Global Transformational Leadership scale" has high reliability and validity and is a valid tool to assess the transformational leadership style of those in positions of responsibility.