Reliability and validity of the Korean version of Morningness–Eveningness Questionnaire in adults aged 20–39 years

Jan 29, 2014Chronobiology international

How reliable and accurate the Korean Morningness-Eveningness Questionnaire is for adults aged 20-39

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Abstract

Cronbach's alpha for the Korean Morningness-Eveningness Questionnaire (MEQ) was 0.77, indicating good internal consistency.

Test-retest reliability of the Korean MEQ showed an intra-class correlation coefficient of 0.90 (p < 0.0001).
A significant negative correlation was found between Korean MEQ scores and reported sleep-wake timing (p < 0.0001).
Differences in bedtime and wake time, as well as mean sleep-wake rhythm acrophase, were observed among different ME types (p < 0.01).
The validity of the Korean MEQ was supported by differences in sleep-wake rhythm acrophases among morning, neither, and evening types.

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Morningness-Eveningness (ME) can be defined by the difference in individual diurnal preference observed from general behavioral patterns including sleep habits. The Horne & Östberg Morningness-Eveningness Questionnaire (MEQ) has been used for classifying ME types. We examined the reliability of a Korean version of the MEQ (Korean MEQ) and verified its validity by comparing responses on the Korean MEQ to objectively-recorded sleep-wake rhythms. After translating and back translating the MEQ from English into Korean, we examined the internal consistency of 19 items of the Korean MEQ in 91 subjects, and the test-retest reliability in 21 subjects who took the Korean MEQ twice, 4 weeks apart. The Korean MEQ was then administered to 1022 young adult subjects. A subset of 46 morning, neither, and evening type subjects took part in a validation study in which their rest-activity timing was collected by actigraphy for 7 days. Cosinor analyses on these data were done to obtain the acrophase and amplitude of the sleep-wake rhythm. Cronbach's alpha of the total scores from the Korean MEQ was 0.77, and the test-retest reliability intra-class correlation coefficient was 0.90 (p < 0.0001). There was a significant negative correlation between Korean MEQ score and reported sleep-wake timing among the entire cohort (p < 0.0001). There was a significant difference in bedtime and wake time (on both work and free days), and in the mean sleep-wake rhythm acrophase, between ME types (p < 0.01). In this study, the validity of the Korean MEQ was verified by illustrating the difference in acrophases of the sleep-wake rhythm between the ME types in young adults.

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Reliability and validity of the Korean version of Morningness–Eveningness Questionnaire in adults aged 20–39 years

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