Epidemiology of Coronavirus Disease in Gansu Province, China, 2020.

Among the 24 COVID-19 cases confirmed in the early period, the estimated mean time from illness onset to first medical visit was 2.8 days (95% CI 1.7–3.8); that is, there was a trend toward longer delay for case-patients in the early period than the mean of 2.3 days (95% CI 1.3–3.2) for the 30 case-patients in the late period ( Figure 4 , panel B), but this difference did not reach statistical significance (p>0.05).

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