Table 2.

Descriptive statistics of data set.

Variable	Number of countries	Number of observations	Mean	Std. dev	Min	Max
Cumulated COVID-19 deaths on 8 May	152	152	1,800	7,800	1	77,000
Growth rate of cumulative COVID-19 deaths on 8 May	152	152	0.026	0.051	0	0.4
Daily growth rate of cumulative COVID-19 deaths	152	6589	0.10	0.26	− 1	9
Cumulated COVID-19 infections on 8 May	152	152	26,000	111,000	23	1,284,000
CFR on 8 May	152	152	0.043	0.037	0.001	0.21
Growth rate of CFR on 8 May	152	152	− 0.011	0.057	− 0.42	0.24
Daily growth rate of CFR	152	6589	0.026	0.20	− 1	5.9
Time-passed by from first reported infection until 8 May	152	152	68	18	29	108
Daily ultraviolet index (UVI)	152	7471	6.8	3.1	0	14
Daily precipitation index	152	7471	0.29	0.31	0	1
Daily cloud index	152	7471	0.50	0.30	0	1
Daily ozone level	152	7471	308	47	236	473
Daily visibility level	152	7471	15	2.2	0.12	16
Daily humidity level	152	7471	0.63	0.20	0.04	1
Minimum temperature per day within a country	152	7471	12	10	− 23	31
Maximum temperature per day within a country	152	7471	23	10	− 16	46