Table 1.
Patient Characteristics for Emergency Department (ED) Encounters With or Without an ICD-9 Diagnosis Code for an Skin and Soft-tissue Infection at 86 US EDs, 2009–2014
| Characteristic | ED Patient Encounters, No. (%) | |||
|---|---|---|---|---|
| Total (N = 25838647) | SSTI ICD-9 Code (n = 820441) | No SSTI ICD-9 Code (n = 25018206) | P Value (χ2 Test) | |
| Pediatric age group (<18 y) | 4966652 (19.2) | 113222(13.8) | 4853430 (19.4) | <.001 |
| Female sex | …a | 397106 (48.4) | … | … |
| Race | ||||
| African American | 7556399 (29.2) | 265698 (32.4) | 7290701 (29.1) |
<.001 |
| Hispanic | 3070216 (11.9) | 85426 (10.4) | 2984790 (11.9) | |
| Other | 2486626 (9.6) | 64467 (7.9) | 2422159 (9.7) | |
| White | 12725406 (29.3) | 404850 (49.4) | 12320556 (49.3) | |
| Payer type | ||||
| Commercial | 7084645 (27.5) | 198011(24.1) | 6886634 (27.5) | <.001 |
| Low SES | 12842335 (49.7) | 460258 (56.1) | 12382077 (49.5) | |
| Medicare | 3744652 (14.5) | 105248 (12.8) | 3639404 (14.6) | |
| Other | 2167015 (8.4) | 56924 (6.9) | 2110091 (8.4) | |
| US region | ||||
| Midwest | 7170812 (27.8) | 232229 (28.3) | 6938583 (27.7) | <.001 |
| Northeast | 9540835 (36.9) | 297807 (36.3) | 9243028 (37.0) | |
| South | 5084045 (19.7) | 169937 (20.7) | 4914108 (19.6) | |
| West | 4042955 (15.7) | 120468 (14.7) | 3922487 (15.7) | |
| Year | ||||
| 2009 | 4057552 (15.7) | 131336 (16.0) | 3926216 (15.7) | <.001 |
| 2010 | 4072286 (15.8) | 132823 (16.2) | 3939463 (15.8) | |
| 2011 | 4167171 (16.1) | 135805 (16.6) | 4031366 (16.1) | |
| 2012 | 4471092 (17.3) | 142960 (17.4) | 4328132 (17.3) | |
| 2013 | 4491725 (17.4) | 141326 (17.2) | 4350399 (17.4) | |
| 2014 | 4578821 (17.72) | 136191 (16.6) | 4442630 (17.8) | |
Abbreviations: ED, emergency department; ICD-9, International Classification of Diseases, Ninth Revision; SES, socioeconomic status; SSTI, skin and soft-tissue infection.
aSex was only available for those with an SSTI-associated code.