Table 1.

Correlation Coefficient Values for Cross-Correlation With Google Flu Trends for Baltimore, Maryland

	Adult ED		Pediatric ED
Variable	No Lag	1-Week Lag	No Lag	1-Week Lag
No. of positive influenza test results	0.876	0.823	0.718	0.741
No. of ED patients with ILI	0.885	0.833	0.652	0.655
ED visit volume	<0.40	<0.40	0.649	0.707
Leaving without being seen	<0.40	<0.40	0.641	0.735
Waiting room time
Combined	<0.40	<0.40	<0.40	<0.40
Levels 1 and 2	<0.40	<0.40	<0.40	<0.40
Level 3	<0.40	<0.40	<0.40	<0.40
Levels 4 and 5	0.421	0.498	<0.40	<0.40
LOS for admitted patients
Combined	<0.40	<0.40	<0.40	<0.40
Levels 1 and 2	<0.40	<0.40	0.406	0.406
Level 3	<0.40	<0.40	<0.40	<0.40
Levels 4 and 5	<0.40	<0.40	<0.40	<0.40
LOS for discharged patients
Combined	<0.40	0.507	<0.40	0.406
Levels 1 and 2	<0.40	<0.40	<0.40	<0.40
Level 3	<0.40	<0.40	<0.40	<0.40
Levels 4 and 5	0.548	0.616	0.445	0.513

Abbreviations: ED, emergency department; ILI, influenzalike illness; LOS, length of stay.