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. 2021 Mar 2;10:100333. doi: 10.1016/j.trip.2021.100333

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© 2021 The Authors

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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Fig. 7 — Cumulative density functions of per-trip distance by projected per-capita income group.

Note. Parentheses indicate the sample size in each income bracket. Broken lines indicate the baseline (average of January 2020 and February 2020) whereas solid lines represent April 2020.