Factorial Structure and Psychometric Characteristics of the Job Stress Index (JSI) within the Bulgarian Cultural Context

Abstract

The present study reports the results of the Bulgarian adaptation of the Job Stress Index (JSI) scale. The research was conducted on a sample of 412 participants. The factorial structure of the instrument was examined, and key descriptive statistics, including means and standard deviations, were calculated. The findings demonstrated satisfactory psychometric properties, providing evidence for the reliability and construct validity of the instrument within the Bulgarian cultural context (α = .942, and KMO measure of sampling adequacy was .938, Bartlett’s test of sphericity was statistically significant χ² = 3989.616, p <.001), confirming that the correlation matrix was appropriate for factor analysis and that the observed correlations were not random. The strong convergence between parametric and non-parametric results, together with the consistent ranking of item effects, provides compelling evidence for the discriminant validity of the scale. Collectively, these results confirm that the questionnaire possesses a high and stable capacity to distinguish between individuals with low and high levels of perceived occupational stress.