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. 2015 Oct 1;6:208. doi: 10.3389/fneur.2015.00208

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Copyright © 2015 Facer-Childs and Brandstaetter.

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) or licensor 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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Age and gender are negligible predictors of circadian phenotype composition and peak performance times. (A) Male teams average age vs. percentage of ECTs. (B) Male teams average age vs. percentage of ICTs. (C) Male teams average age vs. percentage of LCTs. (D) Female teams average age vs. percentage of ECTs. (E) Female teams average age vs. percentage of ICTs. (F) Female teams average age vs. percentage of LCTs. (G) Age vs. predicted peak performance for all teams. (H) Age vs. predicted peak performance in male teams. (I) Age vs. predicted peak performance in female teams. Statistical analysis was carried out using linear regression analysis; ns, not significant, *p < 0.05. Early circadian phenotypes are labeled as ECT, intermediate circadian phenotypes as ICT and late circadian phenotypes as LCT; male teams, ♂; female teams, ♀.