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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