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Table 3 Correlation coefficients calculated between ICD-10 coded cases and NIDS cases, with and without lag periods: All Victorian data, excluding the 2009 influenza season

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 0.433 0.417 0.456 0.404
J06 Acute upper respiratory infection multiple and unspecified sites 0.433 0.451 0.452 0.429
J22 Unspecified acute lower respiratory infection 0.424 0.417 0.435 0.367
B34 Viral infection, unspecified site 0.356 0.401 0.364 0.332
J18 Pneumonia organism unspecified 0.301 0.308 0.308 0.324
  1. *p < 0.0001