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. 2021 Mar 25;9:642630. doi: 10.3389/fpubh.2021.642630

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Copyright © 2021 Hernández-Paniagua, Valdez, Almanza, Rivera-Cárdenas, Grutter, Stremme, García-Reynoso and Ruiz-Suárez.

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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Average diurnal cycles within the MCMA during 2016–2019 and lockdown Phase 2. De-trended diurnal cycles were constructed by subtracting daily averages modelled with Equation (1) from hourly averages to remove the impact of long-term trends. The shading shows the 95% confidence intervals of the average, calculated through bootstrap re-sampling for 1,000 iterations. The numbers show significant changes in diurnal amplitudes, through-to peak, expressed as percentage with 2016–2019 cycles as baseline. *Level of significance p < 0.05. **Level of significance p < 0.01. ***Level of significance p < 0.001.