Does the chronotype classification need to be updated? Preliminary findings

Chronobiology International
B J MartynhakJohn Fontenele Araujo

Abstract

Traditionally, chronotype classification is based on the Morningness-Eveningness Questionnaire (MEQ). It is implicit in the classification that intermediate individuals get intermediate scores to most of the MEQ questions. However, a small group of individuals has a different pattern of answers. In some questions, they answer as "morning-types" and in some others they answer as "evening-types," resulting in an intermediate total score. "Evening-type" and "Morning-type" answers were set as A(1) and A(4), respectively. Intermediate answers were set as A(2) and A(3). The following algorithm was applied: Bimodality Index = (Sigma A(1) x Sigma A(4))(2) - (Sigma A(2) x Sigma A(3))(2). Neither-types that had positive bimodality scores were classified as bimodal. If our hypothesis is validated by objective data, an update of chronotype classification will be required.

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Citations

Jul 30, 2011·Chronobiology International·Lorenzo TonettiVincenzo Natale
Jan 6, 2012·Chronobiology International·Christoph Randler, Christian Vollmer
Jul 25, 2012·Chronobiology International·Noora KanervaSatu Männistö
Aug 22, 2013·Chronobiology International·Cody RaminEva S Schernhammer
Sep 5, 2013·Chronobiology International·Lee Di MiliaChristoph Randler
Jan 15, 2011·Chronobiology International·Senol BeşolukIsa Deveci
Apr 21, 2017·Chronobiology International·Priscila Farias TempakuSergio Tufik
Aug 8, 2018·Chronobiology International·Kati Nowack, Elke Van Der Meer
Apr 25, 2018·Chronobiology International·João Guilherme Fiorani BorgioFernando Mazzilli Louzada

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