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

From: Event-based internet biosurveillance: relation to epidemiological observation

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
  1. *Statistically significant results (p < 0.05) are shown in bold.