Trends in COVID-19 Outbreak in Tokyo and Osaka from January 25 to May 6, 2020: a Joinpoint Regression Analysis of the Outbreak Data

We analyzed the trends of coronavirus disease 2019 (COVID-19) outbreak in Tokyo and Osaka from January 25 to May 6, 2020. To analyze identify significant changes them, we performed a joinpoint regression analysis. From last week March, number COVID-19 cases soared (β = 103.51) 28.07). During 2nd 3rd weeks April, both 157.53) 60.96) experienced peak growth cases. Since almost 14 days after state emergency declaration, showed containment trend Osaka, but continued increase at concerning rate 90.66).