Abstract
ABSTRACTCircadian preference can be measured by a set of questionnaires. While accepting the biological correlates as a good convergent criterion, researchers criticized currently used questionnaires because of their design, weighted number of items, unbalanced scoring or uneven Likert scales. This led to the development of a composite questionnaire, the Morningness-Eveningness-Stability-Scales improved (MESSi). The MESSi contains three constructs: morning affect (MA), eveningness (EV) and stability/distinctness (DI). The aim of this study was a preliminary assessment of a Slovenian translation of the MESSi. Students of five different study programs from the University of Ljubljana, Faculty of Education, participated in the study (N = 275). The scales fit to a three-factor solution, based on exploratory and confirmatory factor analysis. Cronbach’s α were 0.82 (MA), 0.85 (EV), and 0.69 (DI). After allowing covariances (loading onto the same factor) the model fit was good (RMSEA = 0.055). Nearly all sleep-wake variables were correlated with MA and EV in the expected direction. As a conclusion, we can propose to use the MESSi also in Slovenia.
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