Table 3.

Correlation matrix of the floating population and wireless emergency alerts (WEAs) across 25 districts in Seoul between January 2020 and January 2021.

Correlationa	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
(1) Log (floating population)	1.000	0.016	0.028	0.153	0.005b	0.029	0.001c	0.015
(2) Number of WEAs (Nd)	0.016	1.000	0.042	0.106	0.564	0.437	0.805	0.400
(3) Number of daily cumulative WEAs (DCNe)	0.028	0.042	1.000	0.265	0.014	0.025	0.028	0.005b
(4) Number of total cumulative WEAs (TCNf)	0.153	0.106	0.265	1.000	0.033	0.042	0.103	0.023
(5) Number of WEAs with location information	0.005b	0.564	0.014	0.033	1.000	0.216	0.469	0.173
(6) Number of WEAs with date information	0.029	0.437	0.025	0.042	0.216	1.000	0.285	0.195
(7) Number of WEAs with order information	0.001c	0.805	0.028	0.103	0.469	0.285	1.000	0.284
(8) Number of WEAs with disease information	0.015	0.400	0.005b	0.023	0.173	0.195	0.284	1.000

^aAll correlations are significant (P<.001) if there is no note.

^bCorrelation is significant (P=.01).

^cCorrelation is insignificant (P=.65).

^dN: number of WEAs.

^eDCN: the daily cumulative number of WEAs in a specific district.

^fTCN: the total cumulative number of WEAs in a specific district since January 1, 2020, the beginning of the observation period.