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. 2019 Apr 4;10:722. doi: 10.3389/fpsyg.2019.00722

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Copyright © 2019 Hunter, Gillespie and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Diurnal response of amylase for NEs completed by sunset (n = 103). A mixed model accounts for repeated measures per participant and estimated the relationship as log amylase = 3.7 + 0.036^∗(time of day in hours), 95% CI for slope (0.0051, 0.067), p = 0.023. The predictor “time of day” explained 4.3% of level-1 (fixed effects) variance and 4.8% of level-2 (subject-level) variance. The position and flex of the Loess line (dashed) nearly mimics the path of the model’s regression line, corroborating the model fit.