Table 1

Correlation between ILI consultation rates of the sentinel general practice network and four other surveillance systems*
Number of hospital admissions/10,000 inhabitants ILI incidence GIS/10,000 participants Estimated ILI incidence GFT/10,000 inhabitants Number of influenza virus detections
ILI consultation rates, sentinel GPs/10,000 enrolled patients 0.92 0.84 0.84 0.77
(p < 0.001) (p < 0.001) (p < 0.001) (p < 0.001)

ILI influenza-like illness, GIS Great Influenza Survey, GP general practitioner, GFT Google Flu Trends.

*Spearman rank correlation coefficients were determined for the complete study period (20-4-2009 through 3-1-2010).

de Lange et al.

de Lange et al. BMC Public Health 2013 13:881   doi:10.1186/1471-2458-13-881

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