Table 4.
Adjusted ORs (aORs) for All MRSA group compared to non-MRSA SSTI inpatients, MRSA-colonized compared to non-MRSA-colonized SSTI inpatients, and CA-MRSA compared to HA-MRSA for continuous residential ZIP code exposure metrics, stratified by RUCC.
| RUCC stratification group | Outcome
|
|||||
|---|---|---|---|---|---|---|
| All MRSA† | MRSA Colonizationˠ | CA-MRSAǂ | ||||
|
| ||||||
| Cases (n) | (aOR, 95% CI) | Cases (n) | (aOR, 95% CI) | Cases(n) | (aOR, 95% CI) | |
| Density, 100 swine/km2 | ||||||
| 1, Metropolitan urbanized | 21,588 | 1.25 (1.16–1.36) | 3323 | 1.31 (1.11–1.54) | 17,192 | 0.93 (0.77–1.24) |
| 2, Nonmetropolitan urbanized | 1896 | 0.65 (0.54–0.78) | 190 | 1.72 (1.04–2.84) | 1502 | 1.22 (0.77–1.93) |
| 3, Less urbanized | 1957 | 1.10 (0.92–1.31) | 240 | 1.49 (0.96–2.29) | 1587 | 0.90 (0.59–1.37) |
| 4, Thinly populated | 109 | 0.54 (0.13–2.25) | 9 | N/E | 86 | N/E |
| Farms >1000, n/ZIP | ||||||
| 1, Metropolitan urbanized | 21,588 | 1.03 (1.01–1.06) | 3323 | 1.12 (1.07–1.17) | 17,192 | 0.97 (0.92–1.03) |
| 2, Nonmetropolitan urbanized | 1896 | 0.93 (0.90–0.96) | 190 | 1.08 (1.00–1.72) | 1502 | 1.02 (0.95–1.10) |
| 3, Less urbanized | 1957 | 1.01 (0.98–1.03) | 240 | 1.09 (1.03–1.16) | 1587 | 0.98 (0.92–1.04) |
| 4, Thinly populated | 109 | 0.91 (0.66–1.25) | 9 | 0.99 (0.40–2.45) | 86 | 1.13 (0.56–2.28) |
aOR, adjusted odds ratio; CA, Community-Acquired; CI, confidence interval; HA, Hospital Acquired; MRSA, Methicillin Resistant Staphylococcus Aureus; N/E, not able to estimate; RUCC, Rural Urban Continuum Code; SSTI, Skin and Soft Tissue Infection.