Table 2.

USA regression estimates for the change in Covid-19 cases and case fatality rates reported by tests conducted by state in a week.

	(1)	(2)	(3)	(4)	(5)	(6)
	Casesa (ln)	Casesa (ln)	Casesa (ln)	Fatalityb (ln)	Fatalityb (ln)	Fatalityb (ln)
Testing c (ln)	0.167*	0.169*	0.177*	− 0.0805	− 0.0832	− 0.164*
	(0.0700)	(0.0715)	(0.0810)	(0.0413)	(0.0467)	(0.0722)
Days since 100 cases d		− 0.00897	− 0.0147		0.0147	− 0.0210
		(0.00750)	(0.00913)		(0.0120)	(0.0215)
Health expenditure per capita (USD, ln)			0.643*			0.00631
			(0.274)			(0.403)
Aged 70 + with a chronic respiratory disease (ln) e			− 0.0131			− 0.298
			(0.182)			(0.300)
Population (ln)			0.0650			0.270
			(0.0686)			(0.166)
Constant	0.252***	0.433*	− 6.268	0.434***	0.129	− 4.311
	(0.0445)	(0.180)	(3.177)	(0.0782)	(0.296)	(4.849)
Observations	51	51	51	47	47	47
R-squared	0.154	0.177	0.250	0.0167	0.0430	0.140

*p < 0.05, **p < 0.01, ***p < 0.001. Robust standard errors in parentheses. ln stands for natural logarithm.

^aConfirmed cases of Covid-19″ during the week ending April 10th, 2020.

^bCase fatality rate is the ratio between deaths due to Covid-19 and cases in the same period.

^cTesting is the amount of negative and positive tests informed to each country’s health authority in the same period of cases³⁰.

^dThe number of days since the cumulated number of cases was equal to or greater than 100¹.

^eShare of the population aged 70 or older with a chronic respiratory disease, including chronic obstructive pulmonary disease and asthma.