This questionnaire has been validated, with highly significant correlations, by sleep logs and actimetry and correlates well to biochemical rhythms such as melatonin and cortisol. 26 In addition, the phase of entrainment determined by the MCTQ correlates well with the score produced by the MEQ. 27 The circadian oscillator and chronotype Chronotype is influenced by genetics due to the molecular basis of innate circadian rhythm generation.
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