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Table 5 Top correlations calculated between ICD-10 coded cases and NIDS cases during the influenza-seasons (n ≥ 200)

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

During influenza seasons. Not restricted

During influenza seasons & excluding 2009

2009 pandemic season

  

Correlation

p

Correlation

p

Correlation

p

B34

Viral infection, unspecified site

0.617

< 0.0001

0.575

< 0.0001

0.924

< 0.0001

J11

Influenza virus not identified

0.613

< 0.0001

0.545

< 0.0001

0.935

< 0.0001

J06

Acute upper respiratory infection multiple and unspecified sites

0.588

< 0.0001

0.525

< 0.0001

0.924

< 0.0001

R55

Syncope and collapse

*

*

*

*

0.634

0.0149

J22

Unspecified acute lower respiratory infection

0.355

< 0.0001

0.386

< 0.0001

0.523

0.1044

S06

Intracranial injury

0.310

< 0.0001

0.215

0.0050

*

*

T88

Complications of surgical or medical care not specified elsewhere

0.309

< 0.0001

*

*

*

*

J20

Acute bronchitis

0.270

0.0003

0.328

< 0.0001

0.116

0.6924

J00

Acute nasopharyngitis (common cold)

0.263

< 0.0004

0.203

0.0090

0.362

0.2036

J18

Pneumonia organism unspecified

0.253

0.0006

0.294

0.0001

0.384

0.1754

Z20

Contact & exposure to communicable disease

0.219

0.0030

*

*

*

*

T40

Poisoning by opium

0.211

0.0050

*

*

*

*

  1. *Not in top 13 correlations or n < 200