Table 5.
Predictors of Skin and Soft Tissue Infections in Univariate and Multivariate Poisson Regression Models With Clustering by Patient
| Factor | Univariate IRR (95% CI) | Multivariate IRR (95% CI) |
|---|---|---|
| Race/ethnicity | ||
| Non-Hispanic White/Asian/Other | Ref | Ref |
| Non-Hispanic African American | 0.92 (.76–1.11) | 0.84 (.69–1.01) |
| English-speaking Hispanic | 0.88 (.69–1.12) | 0.83 (.65–1.06) |
| Spanish-speaking Hispanic | 0.46a (.36–.60) | 0.44a (.34–.57) |
| CD4+ count (cells/mm3) | ||
| 100+ | Ref | Ref |
| 50–100 | 1.56b (1.19–2.04) | 1.21 (.92–1.60) |
| <50 | 2.28a (1.80–2.90) | 1.45b (1.13–1.87) |
| Viral load (copies/mL) | ||
| <1000 | Ref | Ref |
| 1000+ | 2.17a (1.91–2.46) | 1.79a (1.56–2.06) |
| Male gender | 1.06 (.92–1.22) | … |
| Men who have sex with men | 1.09 (.95–1.25) | … |
| Year | ||
| 2009 | Ref | Ref |
| 2010 | 0.89 (.75–1.06) | 0.92 (.78–1.10) |
| 2011 | 0.90 (.75–1.07) | 0.97 (.81–1.15) |
| 2012 | 0.91 (.76–1.09) | 1.00 (.84–1.20) |
| 2013 | 0.71a (.58–.85) | 0.78c (.65–.95) |
| 2014 | 0.59a (.49–.71) | 0.66a (.55–.80) |
| Age | ||
| <25 | Ref | Ref |
| 25–34 | 0.88 (.64–1.22) | 0.99 (.71–1.37) |
| 35–44 | 0.85 (.61–1.17) | 0.98 (.71–1.36) |
| 45–54 | 0.69c (.50–.95) | 0.80 (.58–1.10) |
| 55–64 | 0.55b (.40–.78) | 0.67c (.48–.95) |
| 65+ | 0.25a (.15–.43) | 0.33a (.19–.55) |
Abbreviations: CI, confidence interval; IRR, incidence rate ratio; Ref, reference category.
a P < .001.
b P < .01.
c P < .05.