The Japanese version of the reduced morningness-eveningness questionnaire

Apr 1, 2024Chronobiology international

Japanese version of the shortened morningness-eveningness questionnaire

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Circadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

The Japanese version of the reduced morningness-eveningness questionnaire (rMEQ) shows strong psychometric properties with a GFI of 0.984.

A one-factor structure was confirmed for the rMEQ, indicating it effectively evaluates morningness-eveningness.
Internal consistency of the rMEQ was found to be moderate, with Cronbach's alpha at 0.618 and McDonald's omega at 0.654.
The rMEQ scores correlated strongly with the original Morningness-Eveningness Questionnaire, with a correlation coefficient of 0.883.
Classification agreement between the rMEQ and the MEQ was 77.6%, suggesting reliability in categorizing circadian typologies.
These findings indicate that the Japanese rMEQ may be useful for efficiently assessing circadian typologies.

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Circadian typology, or "morningness" and "eveningness," is generally assessed using the Morningness-Eveningness Questionnaire (MEQ), a 19-item scale that could be burdensome in large-scale surveys. To overcome this, a 5-item version known as the reduced morningness-eveningness questionnaire (rMEQ), which is sensitive to the assessment of circadian typology, was developed; however, a validated Japanese version of the rMEQ is yet to be established. This study aimed to develop and validate the Japanese version of the rMEQ. Five essential items for the rMEQ were selected from existing Japanese MEQ data ( = 2,213), and the rMEQ was compiled. We conducted a confirmatory factor analysis for the psychometric properties of the rMEQ and confirmed its robust one-factor structure for evaluating morningness-eveningness (GFI = 0.984, AGFI = 0.951, CFI = 0.935, and RMSEA = 0.091). Reliability was evaluated via internal consistency of rMEQ items using Cronbach'sand McDonald's, and the values were 0.618 and 0.654, respectively. The rMEQ scores strongly correlated with MEQ ( = 0.883, < 0.001), and classification agreement (Morning, Neither, and Evening types) between rMEQ and MEQ was 77.6% (Cramer's = 0.643, Weighted Cohen's = 0.72), confirming the validity. The Japanese rMEQ may be a valuable tool for the efficient assessment of circadian typologies. N α ω ρ p V κ

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The Japanese version of the reduced morningness-eveningness questionnaire

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