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Table 2 Properties of the reference data

From: Validity and timeliness of syndromic influenza surveillance during the autumn/winter wave of A (H1N1) influenza 2009: results of emergency medical dispatch, ambulance and emergency department data from three European regions

     Influenza pandemic according to reference data in 2009
Reference data for… Reference data source Geographical level Reporting delay* Start week Peak week Duration (weeks) Duration (days)
EMD-AT, EP-AT Information on sick leave due to acute respiratory infections from a major Tyrolean health insurance. regional information for week x available on week x + 1 44 47 9 67$
(Tyrol, Austria)
EP-BE, Notified influenza cases of the sentinel general practitioner system. national information for week x available on week x + 3 40 44 10 70
ED-BE (Belgium)
ED-ES Notified influenza cases of the sentinel general practitioner system. regional information for week x available on week x + 3 41 (period 1) 43 8 56
   (Autonomous Region Cantabria, Spain)   49 (period 2)    
  1. *week: Monday (day 1), …, Sunday (day 7).
  2. The course of the autumn/winter wave was derived from regional data of the Tyrolean health insurance; the start week of the autumn/winter wave was derived from national data [27].
  3. $last week of 2009 (week 52) contained 11 days.