Table 2.

The correlation between the national COVID-19 Baidu Index and real-world data from January 20 to April 20, 2020.

Baidu Index		New confirmed cases	New death cases	New cured discharge cases	Cumulative confirmed cases	Cumulative death cases	Cumulative cured discharge cases
Lag –6 days
	Spearman correlation coefficient	0.689	0.868	0.452	–0.576	–0.583	–0.678
	P value	<.001	<.001	<.001	<.001	<.001	<.001
Lag –5 days
	Spearman correlation coefficient	0.721	0.873	0.391	–0.633	–0.639	–0.729
	P value	<.001	<.001	<.001	<.001	<.001	<.001
Lag –4 days
	Spearman correlation coefficient	0.751	0.876	0.325	–0.692	–0.695	–0.793
	P value	<.001	<.001	.002	<.001	<.001	<.001
Lag –3 days
	Spearman correlation coefficient	0.775	0.865	0.255	–0.753	–0.754	–0.846
	P value	<.001	<.001	.02	<.001	<.001	<.001
Lag –2 days
	Spearman correlation coefficient	0.776	0.855	0.193	–0.814	–0.814	–0.905
	P value	<.001	<.001	.07	<.001	<.001	<.001
Lag –1 day
	Spearman correlation coefficient	0.789	0.841	0.180	–0.878	–0.875	–0.933
	P value	<.001	<.001	.09	<.001	<.001	<.001
Lag 0
	Spearman correlation coefficient	0.795	0.806	0.170	–0.942	–0.941	–0.942
	P value	<.001	<.001	.11	<.001	<.001	<.001
Lag 1 day
	Spearman correlation coefficient	0.780	0.769	0.165	–0.977	–0.974	–0.941
	P value	<.001	<.001	.12	<.001	<.001	<.001
Lag 2 days
	Spearman correlation coefficient	0.772	0.748	0.165	–0.983	–0.978	–0.942
	P value	<.001	<.001	.12	<.001	<.001	<.001
Lag 3 days
	Spearman correlation coefficient	0.759	0.738	0.165	–0.987	–0.982	–0.947
	P value	<.001	<.001	.12	<.001	<.001	<.001
Lag 4 days
	Spearman correlation coefficient	0.759	0.733	0.162	–0.988	–0.983	–0.945
	P value	<.001	<.001	.13	<.001	<.001	<.001
Lag 5 days
	Spearman correlation coefficient	0.763	0.723	0.163	–0.989	–0.983	–0.944
	P value	<.001	<.001	.13	<.001	<.001	<.001
Lag 6 days
	Spearman correlation coefficient	0.754	0.729	0.164	–0.989	–0.983	–0.943
	P value	<.001	<.001	.13	<.001	<.001	<.001