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. 2021 Apr 29;5(9):bvab075. doi: 10.1210/jendso/bvab075

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© The Author(s) 2021. Published by Oxford University Press on behalf of the Endocrine Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 3. — Cross-correlations between LH and T. Cross-correlations between LH concentrations and (A) total T concentrations, (B) T secretion rates, (C) free T concentrations, and (D) bioavailable T concentrations in all 20 participants. Cross-correlation assesses the relative strength between 2 hormone time series for all possible time shifts. The graph displays the correlation (y-axis) at a lag time in minutes (x-axis) with each gray line corresponding with 1 participant. The black line indicates the mean correlation for all participants and the 2 dark gray lines indicate the 95% CI. The significance level is indicated by 2 straight dotted lines at correlations –0.18 and +0.18. Negative lag times represent a correlation in which hormone 2 is followed by hormone 1 and positive lag times represent a correlation in which hormone 1 is followed by hormone 2. T, testosterone.