Table 1.
Summary statistics for final ICEES multivariate dataset used for model development.
| Feature Variable (ICEES Feature Variable Name) | Variable Enumeration | N (%) |
|---|---|---|
| Total Annual ED or Inpatient Visits for Respiratory Issues | 1 | 9633 (67.6%) |
| 2 | 2677 (18.8%) | |
| 3 | 1067 (7.5%) | |
| 4 | 492 (3.5%) | |
| 5 | 210 (1.5%) | |
| 6 | 115 (0.8%) | |
| 7 | 43 (0.3%) | |
| 8 | 13 (0.1%) | |
| Sex (Sex2) | 0 (Male) | 6231 (43.7%) |
| 1 (Female) | 8019 (56.3%) | |
| Race (Race) | Caucasian | 8457 (59.3%) |
| African American | 4111 (28.9%) | |
| Asian, Native Hawaiian/Pacific Islander, American/Alaskan Native, Other | 1682 (11.8%) | |
| Prescription or Administration of Prednisone (Prednisone) 1 | 0 (No) | 12,978 (91.1%) |
| 1 (Yes) | 1272 (8.9%) | |
| Diagnosis of Obesity (ObesityDx) 2 | 0 (No) | 12,859 (90.2%) |
| 1 (Yes) | 1391 (9.8%) | |
| Maximum Daily PM2.5 Exposure, µg/m3 (MaxDailyPM2.5Exposure_StudyMax) | 1 (6.58, 25.09) | 878 (6.2%) |
| 2 (25.09, 98.76) | 13,372 (93.8%) | |
| Residential Distance to a Major Roadway or Highway, Meters (RoadwayDistanceExposure2) | 1 (0–49) | 1629 (11.4%) |
| 2 (50–99) | 1008 (7.1%) | |
| 3 (100–149) | 878 (6.2%) | |
| 4 (150–199) | 922 (6.5%) | |
| 5 (200–249) | 861 (6.0%) | |
| 6 (≥250) | 8952 (62.8%) | |
| Estimated Residential Density, Persons (EstResidentialDensity) 3 | 1 (0, 2500) | 10,321 (72.4%) |
| 2 (2500, 50,000) | 3929 (27.6%) | |
| 3 (50,000, infinity) | 0 (0.0%) | |
| TOTAL | 14,250 | |
Abbreviations: ED, emergency department; PM2.5, particulate matter ≤ 2.5 µm in diameter. 1 One or more prescriptions for prednisone over one-year study period. 2 One or more diagnoses for obesity over one-year study period. 3 US Census Bureau American Community Survey 2007–2011 estimated total population (block group), binned according to U.S. Census Bureau definitions (1, rural (0, 2500); 2, urban cluster (2500, 50,000); 3, urbanized area (50,000, inf).