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. 2022 Jun 21;10:874455. doi: 10.3389/fpubh.2022.874455

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Copyright © 2022 Gong, Wang, Zhang, Elahe and Jin.

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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Correlation coefficient matrix heatmap of all 29 variables. The obtained numerical matrix is visually displayed through a heatmap. Orange indicates a positive correlation, and green indicates a negative correlation. Color depth indicates the value of the coefficient, with deeper colors indicating stronger correlations. Specifically, redder colors indicate correlation coefficients closer to 1, and greener colors indicate coefficients closer to −1.