Event-based internet biosurveillance: relation to epidemiological observation

Table 2 Correlation coefficients for Argus alerts versus WHO case counts for October 2009 (week 41 2009) to January 2010 (week 5 2010) ^*

Alert criteria as listed in Table 1	Number of email alerts, N	Pearson correlation coefficient	P_value
Alert 1	56	0.80	<.0001
Alert 2	9	0.46	0.0522
Alert 3	147	0.62	0.0057
Alert 4	228	0.24	0.3367
Alert 5	84	0.26	0.2979
Alert 6	102	0.76	0.0003
Alert 7	10	0.01	0.9651
Alert 8	7	0.12	0.6352
Alert 9	84	0.10	0.6878
Alert 10	35	0.25	0.3123
Alert 11	175	0.02	0.9312
Alert 12	2	0.43	0.072
Alert 13	191	0.67	0.0025
Alert 15	6	0.58	0.0122

ISSN: 1742-7622