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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