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Volume 14, Number 6—June 2008

Research

Validation of Syndromic Surveillance for Respiratory Pathogen Activity

Cees van den Wijngaard*Comments to Author , Liselotte van Asten*, Wilfrid van Pelt*, Nico J.D. Nagelkerke†, Robert Verheij‡, Albert J. de Neeling*, Arnold Dekkers*, Marianne A.B. van der Sande*, Hans van Vliet*, and Marion P.G. Koopmans*
Author affiliations: *National Institute for Public Health and the Environment, Bilthoven, the Netherlands; †United Arab Emirates University, Al-Ain, United Arab Emirates; ‡Netherlands Institute of Health Services Research, Utrecht, the Netherlands;

Main Article

Figure 2

The (maximum) R2 by the lagged syndromes with the hospital syndrome as a reference. Aggregated by week, univariate Pearson correlation coefficients were calculated of the hospital syndrome and each of the other syndromes. Note that the Pearson correlation coefficients are calculated over different periods for the different registries because not all registries cover the same period (Table 1). Measured by the syndrome lag with the maximized R2, the timeliness differed between the registries in the following order: absenteeism, hospital, pharmacy/general practice (GP), mortality/laboratory submissions (as projected on the x-axis).

Figure 2. The (maximum) R2 by the lagged syndromes with the hospital syndrome as a reference. Aggregated by week, univariate Pearson correlation coefficients were calculated of the hospital syndrome and each of the other syndromes. Note that the Pearson correlation coefficients are calculated over different periods for the different registries because not all registries cover the same period (Table 1). Measured by the syndrome lag with the maximized R2, the timeliness differed between the registries in the following order: absenteeism, hospital, pharmacy/general practice (GP), mortality/laboratory submissions (as projected on the x-axis).

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