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. 2020 Sep 30;17(170):20200518. doi: 10.1098/rsif.2020.0518

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 6. — Comparison of the two classes of infection spread. (a) The timing of the infection: the distribution of time of reaching 1 case per million (counting from 22 January), for the exponential and power law classes. The means are 48 days for the power law and 52 days for the exponential set (p = 0.035 by t-test). (b) Country size: the area of countries for the exponential and power law classes. The means are about 2.3 × 10⁵ km² for the power law and 1.7 × 10⁶ km² for the exponential, p = 0.018 by t-test. (c) Country density: the means are about 374 people per km² for the power law and 98 people per km² for the exponential law, p = 0.035 by t-test.