Sooyeon Suh1,2, Soo Hyun Kim1, Hyera Ryu1, Su Jung Choi3,4, Eun Yeon Joo5,6. 1. Department of Psychology, Sungshin Women's University, Seoul, South Korea. 2. Department of Psychiatry, Stanford University, Palo Alto, CA, USA. 3. Department of Nursing, Samsung Medical Center, Seoul, South Korea. 4. Department of Clinical Nursing Science, Graduate School of Clinical Nursing Science, Sungkyunkwan University, Seoul, South Korea. 5. Department of Neurology, Neuroscience Center, Samsung Biomedical Research Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Samsung Medical Center, Annex 3rd F, #7, Gangnam-gu, Seoul, 06351, South Korea. ejoo@skku.edu. 6. Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea. ejoo@skku.edu.
Abstract
PURPOSE: The Munich Chronotype Questionnaire (MCTQ) assesses actual sleep-wake timing and has advantages compared to prior chronotype questionnaires in that it differentiates sleep-wake patterns between work days and free days and uses corrected mid-sleep time on free days after correcting for accumulated sleep debt over the week to categorize chronotype. The current study, we validated the Korean version of the MCTQ. METHODS: In this study, 310 participants (mean age = 27.09 ± 5.64; 78.1% females) completed the Korean version of the MCTQ. RESULTS: MCTQ parameters were significantly correlated with MEQ (Morningness-Eveningness Questionnaire) scores (│r│ ≥ 0.48), and test-retest reliability was ≥ 0.72. Cutoff scores of 2.5%, which correlated to 2.36 and 8.57 mid-sleep times in our sample, showed the best convergence with MEQ when categorizing chronotype. CONCLUSIONS: Our study suggests that the MCTQ is a useful questionnaire in assessing chronotype in young adults.
PURPOSE: The Munich Chronotype Questionnaire (MCTQ) assesses actual sleep-wake timing and has advantages compared to prior chronotype questionnaires in that it differentiates sleep-wake patterns between work days and free days and uses corrected mid-sleep time on free days after correcting for accumulated sleep debt over the week to categorize chronotype. The current study, we validated the Korean version of the MCTQ. METHODS: In this study, 310 participants (mean age = 27.09 ± 5.64; 78.1% females) completed the Korean version of the MCTQ. RESULTS: MCTQ parameters were significantly correlated with MEQ (Morningness-Eveningness Questionnaire) scores (│r│ ≥ 0.48), and test-retest reliability was ≥ 0.72. Cutoff scores of 2.5%, which correlated to 2.36 and 8.57 mid-sleep times in our sample, showed the best convergence with MEQ when categorizing chronotype. CONCLUSIONS: Our study suggests that the MCTQ is a useful questionnaire in assessing chronotype in young adults.
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