Psychometric properties of the Turkish reduced morningness and eveningness questionnaire

ABSTRACT

The aim of this study was to examine the psychometric properties of the 5-item Turkish Reduced Morningness-Eveningness Questionnaire (rMEQ) for the first time. The study involved 875 university students in an adaptation and validation study. Participants completed the rMEQ, MEQ, Depression Anxiety Stress Scale-21 (DASS-21), Insomnia Severity Index (ISI), Barratt Impulsiveness Scale Short Form (BIS-SF), and Oxford Happiness Questionnaire Short Form (OHQ-SF). The factor structure, convergent validity, internal consistency, sensitivity, and specificity of the rMEQ were examined. The confirmatory factor analysis showed that the rMEQ had a one-dimensional structure with good fit indices (χ2/df = 2.94, CFI = 0.990, TLI = 0.979, RMSEA = 0.047, and SRMR = 0.019). There was a significantly strong correlation between rMEQ and MEQ. In addition, we found a significantly weak correlation between rMEQ and DASS-21, ISI, BIS-SF, and OHQ-SF. The internal consistency coefficients of rMEQ were Cronbach’s α = 0.706 and McDonald’s ω = 0.740. The sensitivity and specificity of rMEQ were 83.3%–92.7% for morning types and 86.3%–87.3% for evening types. The Turkish rMEQ has adequate psychometric properties and can be used to assess an individual’s chronotype.

KEYWORDS:

• Chronotype
• circadian rhythm
• reduced morningness–eveningness questionnaire
• validity and reliability

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/07420528.2024.2339964.

Additional information

Funding

The author(s) reported there is no funding associated with the work featured in this article.