Table B.1.

BL test on the entire phase of COVID-19.

Johns Hopkins Coronavirus Resource Centera				BL test
Country	The entire phase (Dates in 2020)	T		${\chi }_{stat}^2$	$p$-value
US	02/29 $\sim$06/18	111		15.364	0.052
China	01/22 $\sim$06/18	149		275.420	< 0.001
South Korea	02/20 $\sim$06/18	120		177.680	< 0.001
Japan	02/13 $\sim$06/18	127		69.904	< 0.001
UK	03/05 $\sim$06/18	106		51.742	< 0.001
Spain	03/03 $\sim$06/18	108		158.54	< 0.001
Italy	02/21 $\sim$06/18	119		97.019	< 0.001
Germany	03/09 $\sim$06/18	102		183.750	< 0.001
Netherlands	03/06 $\sim$06/18	105		135.14	< 0.001
Sweden	03/11 $\sim$06/18	100		46.633	< 0.001

Note: The entire phase is the period from the date when the first death was observed after January 22, 2020, to the date of June 18, 2020. T denotes the length of the data points.

^aData source: https://coronavirus.jhu.edu/.