. 2020 Dec 9;194:110596. doi: 10.1016/j.envres.2020.110596

Table 1.

Pearson correlations between the variables and the log (Td).

Variables	Germany	Italy	Spain	The United Kingdom
Temperature	0.66^a	0.64^a	0.47^a	0.75^a
Absolute humidity	0.55^a	0.50^a	0.25^a	0.67^a
DTR	0.07^a	0.10^a	0.12^a	−0.01
Population density	−0.34	−0.30	−0.02	−0.97^a
GRI lag14	0.65^a	−0.05^a	0.68^a	0.62^a

p < 0.05. Td: the COVID-19 case doubling time; log (Td): the common logarithm of the Td; DTR, diurnal temperature range; GRI lag14: the government response index at single 14-day-lagged.