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Table 2 'Best' ICD-10 diagnoses and correlations with NIDS cases, for 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 Full dataset Postcode restricted
   Correlation p Correlation p
J11 Influenza virus not identified 0.481 < 0.0001 0.419 < 0.0001
J06 Acute upper respiratory infection multiple and unspecified sites 0.473 < 0.0001 0.452 < 0.0001
J22 Unspecified acute lower respiratory infection 0.433 < 0.0001 0.391 < 0.0001
B34 Viral infection, unspecified site 0.398 < 0.0001 0.405 < 0.0001
J18 Pneumonia organism unspecified 0.302 < 0.0001 0.250 < 0.0001
'Best' codes combined (r s >0.3) 0.557 < 0.0001 0.560 < 0.0001