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Adaptation of the Morningness-Eveningness Stability Scale improved (MESSi) into Turkish
Eda Demirhan1, İsmail Önder2, Mehmet Barış Horzum3
1a Faculty of Education, Department of Special Education , Sakarya University , Turkey.
Chronobiology International
|January 8, 2019
Summary
The Morningness-Eveningness Stability Scale improved (MESSi) was adapted for Turkish students, showing it is a valid tool for assessing chronotype and its links to personality and well-being.
Area of Science:
- Chronobiology
- Psychometrics
- Personality Psychology
Background:
- Morningness-eveningness, a key individual difference, influences behavior, personality, and health.
- Existing chronotype assessment tools require validation in diverse linguistic and cultural contexts.
Purpose of the Study:
- To adapt and validate the Morningness-Eveningness Stability Scale improved (MESSi) for use with Turkish students.
- To examine the concurrent validity of the MESSi with established measures of personality, sleep quality, and affect.
Main Methods:
- The MESSi was administered to 1,076 Turkish students (ages 14-47).
- Concurrent validity was assessed using the Big Five Inventory (BIG-5), Subjective Alertness Scale, Pittsburgh Sleep Quality Index (PSQI), and Positive and Negative Affect Schedule (PANAS).
- Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) were employed to confirm the scale's structure.
Main Results:
- Factor analysis confirmed a three-factor structure for the MESSi in the Turkish sample.
- Conscientiousness positively correlated with morning affect (MA) and negatively with eveningness (EV).
- Extraversion correlated negatively with distinctness (DI) and positively with MA.
- MA positively related to morning alertness and negatively to evening alertness.
- EV and DI positively correlated with poor sleep quality (PSQI scores) and negatively with MA.
- MA positively correlated with positive affect (PA) and negatively with negative affect (NA).
- DI negatively correlated with PA and positively with NA.
Conclusions:
- The Turkish version of the MESSi is a valid and reliable instrument for assessing morningness-eveningness.
- The findings support the association between chronotype, personality traits, sleep quality, and affect in Turkish students.
- The MESSi can be effectively utilized in research and clinical settings with Turkish populations.
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