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. 2021 Jun 2;11:11616. doi: 10.1038/s41598-021-91220-4

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Relative risks of acquiring the COVID-19 infection by place of contact with COVID-19 patients. The figure shows subgroup-specific risk ratios (RR) for subjects in different groups divided by the places and levels of recent contact history with COVID-19 patients. The crude RR for each subgroup is plotted as a black square, and the size of each plot is proportional to the number of subjects in each subgroup. Error bars represent 95% confidence intervals of the RR. Individuals with recent close contact outside their residences (n = 1034) were considered as the control group, corresponding to an RR value of 1.0 (the solid vertical line). The values of RR above 1.0 indicate that people in each group are more likely to have a positive SARS-CoV-2 RT-PCR test result. An RR value of < 1.0 indicates a lower RT-PCR test positivity rate. The calculated RR are plotted on a logarithmic scale. COVID-19, coronavirus disease; RR, risk ratios; RT-PCR, reverse transcription polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.