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Volume 13, Number 2—February 2007

Research

Code-based Syndromic Surveillance for Influenzalike Illness by International Classification of Diseases, Ninth Revision

Nicola Marsden-Haug*1, Virginia B. Foster*, Philip L. Gould†, Eugene Elbert*2, Hailiang Wang*, and Julie A. Pavlin*3Comments to Author 
Author affiliations: *Walter Reed Army Institute of Research, Silver Spring, Maryland, USA; †Air Force Institute for Operational Health, Brooks City Base, Texas, USA;

Main Article

Table 5

Unmatched outpatient visit data and final influenzalike illness (ILI) syndromic groupings*

ICD-9 codeUnmatched data†
ILI group
Total volume of code use (2001–04)Average daily countCorrelation with positive specimensp valueSignal -to-noise ratioOriginalNew (final)
079.991,115,1437180.7746<0.00012.84YesLarge
780.6470,7703030.7545<0.00012.55YesLarge
466.0632,2564070.6693<0.00012.17YesLarge
486322,3972080.7180<0.00012.09YesLarge
465.93,989,6882,5690.6758<0.00011.91YesLarge
461.9741,0854770.6017<0.00011.81NoLarge
382.91,185,8097640.6286<0.00011.76NoLarge
460361,1392330.5552<0.00011.55YesLarge
490297,9181920.6337<0.00011.50YesLarge
786.2545,5103510.5573<0.00011.24YesLarge
487.162,340400.8696<0.00015.59YesSmall
487.88,97360.7926<0.00014.74YesSmall
487.05,09330.6205<0.00013.11YesSmall
465.872,042460.6384<0.00011.86YesSmall
466.1118,377120.4800<0.00011.83Yes
466.1968,127440.5257<0.00011.65Yes
480.245100.3316<0.00011.64Yes
4621,436,3259250.5468<0.00011.61Yes
480.11,79010.4083<0.00011.58Yes
382.00277,2701790.4868<0.00011.58No
480.910,85270.4562<0.00011.44Yes
478.97,43450.4296<0.00011.23Yes
461.8123,913800.3083<0.00011.14No
465.033,760220.4804<0.00011.11Yes
484.84,31230.3202<0.00011.11Yes
480.811,70880.3501<0.00011.07Yes
079.8917,729110.3355<0.00011.05Yes
4857,95450.4180<0.00010.99Yes
464.203,53920.3852<0.00010.88Yes
463168,4991080.3176<0.00010.08No
784.159,516380.2994<0.00010.59Yes
464.101,73610.25600.00020.56Yes
480.028700.08890.20820.24Yes
464.0022,470140.11330.10850.14Yes

*NOS, not otherwise specified; NEC, not elsewhere classified (as listed in the International Classification of Diseases, 9th Revision).
‡ Department of Defense–wide outpatient visit data, October 2000–December 2004.

Main Article

1Current affiliation: Tacoma–Pierce County Health Department, Tacoma, Washington, USA

2Current affiliation: US Census Bureau, Suitland, Maryland, USA

3Current affiliation: Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA

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