Table 4.
Epidemiologic Predictors for Inclusion in a Genomic Cluster Supported by Maximum Likelihood and Bootstrap Analysis
| Epidemiologic Factor | Number (%) of Individuals in a Cluster (n = 21)a | Number (%) of Individuals not in Any Cluster (n = 53) | P Value |
|---|---|---|---|
| Human immunodeficiency virus infected | 18 (86) | 35 (66) | .15 |
| Gender | |||
| Male | 16 (76) | 41 (77) | .91 |
| Female | 5 (24) | 12 (23) | |
| African-American race | 20 (95) | 32 (60) | .004 |
| Hispanic ethnicity | 0 (0) | 9 (17) | .05 |
| Men who have sex with men | 6 (29) | 15 (28) | .99 |
| Current residence in a high detainee-release zip code | 10 (47) | 15 (28) | .11 |
| Current drug use | 7 (33) | 10 (19) | .18 |
| Temporary housing residence currently or in the past yearb | 4 (19) | 5 (9) | .26 |
| Current incarceration | 0 | 5 (9) | .31 |
| Healthcare exposure in the past yearc | 12 (57) | 30 (57) | .82 |
a Cluster defined as a collection of 3 or more USA300 methicillin-resistant Staphylococcus aureus isolates with genetic similarity supported by bootstrap (>90%) and maximum likelihood analysis.
b Temporary housing residence includes being homeless or residing in a homeless shelter or substance abuse center.
c Healthcare exposure in the past year included visits to the emergency room or hospitalization at Stroger Hospital of Cook County.