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Relationship between MEQ score and age. The age (in years) for each of the 145 participants is plotted with respect to their MEQ score. MEQ scores can range from 18 to 86, with higher numbers indicating greater morningness. There was a significant association between age and MEQ score when evaluated with a mixed model (see text) and there was a significant correlation (Pearson correlation coefficient r = 0.33, P < 0.0001).
Abbreviation: MEQ, Morningness–Eveningness Questionnaire.
