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. 2021 Jun 18;201:111529. doi: 10.1016/j.envres.2021.111529

Table 2.

Correlation Kendall's tau τ_b, using confirmed cases evaluated at national level, considering all regions of Italy, France, and Spain.

		Italy	N = 20
		Import Export	GDP PC	Density of population	Confirmed cases 1 peak	Confirmed cases 2 peak	Confirmed cases 3 peak
Import Export	Correlation Coefficient	1	.295^a	.599**	.747**	.779**	.853**
GDP PC	Correlation Coefficient	.295^a	1	0.143	.400**	0.263	0.253
Density of population	Correlation Coefficient	.599**	0.143	1	.557**	.695**	.706**
		France	N = 13
Import Export	Correlation Coefficient	1	0.256	.462^a	.641**	.641**	.667**
GDP PC	Correlation Coefficient	0.256	1	.487^a	0.103	0.205	0.231
Density of population	Correlation Coefficient	.462^a	.487^a	1	0.256	.359^a	0.333
	Spain	N = 19
Import Export	Correlation Coefficient	1	.298^a	−0.041	.684**	.754**	.754**
GDP PC	Correlation Coefficient	.298^a	1	0.006	.357^a	.287^a	0.24
Density of population	Correlation Coefficient	−0.041	0.006	1	−0.216	−0.099	−0.099

^a

Correlation is significant at the 0.05 level (1-tailed). ** Correlation is significant at the 0.01 level (1-tailed).