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3.2.2. Explanatory variables

LW Lan Wang
SZ Surong Zhang
ZY Zilin Yang
ZZ Ziyu Zhao
AM Anne Vernez Moudon
HF Huasen Feng
JL Junhao Liang
WS Wenyao Sun
BC Buyang Cao
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County-level data for the explanatory variables is categorized according to the research framework presented in Section 3.1. The data relating to vulnerable populations are obtained from a variety of data sources:

Data for the variables depicting the transmission pathways are mainly related to the built environment and socio-economic activity, which are obtained from the following sources:

For healthcare resources, the dataset on the ratio of population to Primary Care Physicians, ICU beds, and licensed beds is gathered from the website of ESRI COVID-19 Overview (2020), released on March 21st, 2020.

The definition and descriptive statistics of explanatory variables are presented in Table 1 .

The definition and descriptive statistics of the explanatory variables (full sample, n = 643).

Copyright and License information:  ©2021 The Author(s)
Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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