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Table 5 Results of three timeliness methods for the identification of the start of the autumn/winter wave of the A (H1N1) influenza pandemic (as reported by the reference data) with syndromic surveillance data in 2009

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

Data source

Peak comparison

Cross-correlation function

First aberration detected by Poisson CUSUM

(weeks)

(weeks)

(days)

 

Without reporting delay+

With reporting delay+

EMD-AT

na*

not significant

0

-6

EP-AT

na*

not significant

na*

na*

EP-BE

-1

-1

+10

+2

  

0.60

  

ED-BE

-1

not significant

0

-8

ED-ES

+1

+1

+19 (period 1)

+11 (period 1)

  

0.89

0 (period 2)

-8 (period 2)

  1. *na = not applicable.
  2. +reporting delay refers to the time needed for collecting and processing the data.