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. 2020 Dec 17;11:583870. doi: 10.3389/fneur.2020.583870

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Copyright © 2020 Planchuelo-Gómez, Trigo, de Luis-García, Guerrero, Porta-Etessam and García-Azorín.

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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Summary of mix PCA of headache intensity and disability caused by headache (continuous variables), and the analyzed categorical features. X- and Y-axis contain the values of the first and second principal components, and the relative contribution of each continuous variable to the component, remarking in bold the most important relationships between the continuous variables and the components. 0 = no symptom; 1 = present symptom. (A) Levels—Platelets intensity and disability. (B) Levels—COVID-19 symptoms intensity and disability. (C) Levels—Migraine symptoms intensity and disability. (D) Levels—Quality of pain intensity and disability. (E) Levels—Laterality and topography intensity and disability. (F) Levels—Most frequent symptoms intensity and disability.