Mobility indicators by groups

With trip records between November 2019 and September 2020 in Kunming, China, we identify people who relied on traveling by subway both before and after the first pandemic wave. We define frequent travelers as those who traveled at least three days in each week during the four consecutive weeks before the pandemic. Comparing the same individual’s trip records in September 2020, those who still traveled at least three days in each week are defined as samples.Then they mobility indicators are calculated by weeks.