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. 2022 Nov 3;146:104562. doi: 10.1016/j.jedc.2022.104562

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Fig 1 — Proportion of Case Origin Disclosing Prefectures among Prefectures with New Daily Confirmed Cases

Figure 1 presents the evolution of the proportion of case origin disclosing prefectures (among prefectures that reported new daily confirmed cases) over time. The left vertical axis denotes the proportion of case origin disclosing prefectures; the right vertical axis denotes the daily increase of confirmed cases; the horizontal axis presents the calendar day (on the every other day basis) in our sample period from January 22 to March 16, 2020. On February 12, 2020, Hubei province started to include the number of clinical diagnosis cases in the reported number of confirmed cases, resulting in a spike in newly confirmed cases, mainly in Wuhan. The peak in the proportion of case origin disclosing prefectures among prefectures reporting new daily confirmed cases near the end of the sample period is because there were a small number of prefectures reporting new daily confirmed cases (and hence a small denominator in calculating the proportion) on those days. For example, March 8, 2020, only has one prefecture with confirmed cases.