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Table 1 Correlation coefficients calculated between ICD-10 coded cases and NIDS cases with and without lag periods: all Victorian data, all seasons, 2001-2009

From: Syndromic surveillance for influenza in two hospital emergency departments. Relationships between ICD-10 codes and notified cases, before and during a pandemic

ICD-10 Code Description No lag* 1 week lag* 2 week lag* 3 week lag*
J11 Influenza virus not identified 0.481 0.465 0.493 0.438
J06 Acute upper respiratory infection multiple and unspecified sites 0.473 0.488 0.486 0.458
J22 Unspecified acute lower respiratory infection 0.433 0.429 0.447 0.380
B34 Viral infection, unspecified site 0.398 0.436 0.393 0.358
J18 Pneumonia organism unspecified 0.302 0.310 0.306 0.316
  1. * p < 0.0001