Table 1.
Demographic, clinical, and MRSA risk factors of populationa
| Characteristic | % (no.) of patients |
P value | |||
|---|---|---|---|---|---|
| Total (n = 31) | No New MRSA skin infection (n = 26) | New MRSA skin infection (n = 5) | Relative risk (95% CI) | ||
| Age in yrs, mean ± SD (range) | 40 ± 16 (18–80) | 39 ± 17 (22–80) | 40 ± 17 (18–58) | 1.0 (0.95-1.05) | 0.94 |
| Gender | |||||
| Male | 42 (13) | 35 (9) | 80 (4) | Ref | |
| Female | 58 (18) | 65 (17) | 20 (1) | 5.5 (0.02–1.7) | 0.13 |
| Ethnicity | |||||
| Caucasian | 45 (14) | 46 (12) | 40 (2) | Ref | |
| Hispanic | 32 (10) | 31 (8) | 40 (2) | 1.4 (0.24–8.3) | 0.71 |
| Other | 23 (7) | 23 (6) | 20 (1) | 1.0 (0.11–9.2) | 0.99 |
| Comorbidities | |||||
| Diabetes | 6 (2) | 8 (2) | 0 (0) | – | 0.99 |
| Hypertension | 16 (5) | 19 (5) | 0 (0) | – | 0.56 |
| Cancer | 6 (2) | 8 (2) | 0 (0) | – | 0.99 |
| No. of previous skin infections in prior 6 months, mean ± SD (range) | 5 ± 6 (2–30) | 5 ± 6 (2–9) | 4 ± 3 (2–30) | 0.96 (0.79–1.2) | 0.68 |
| Other clinical/behavioral | |||||
| Complete (100%) adherence to decolonization regimen | 81 (25) | 77 (20) | 100 (5) | – | 0.55 |
| Recent surgery | 6 (2) | 8 (2) | 0 (0) | – | 0.13 |
| Recent hospitalization | 36 (11) | 42 (11) | 0 (0) | – | 0.99 |
| Healthcare worker | 19 (6) | 19 (5) | 20 (1) | 0.95 (0.13-7.1) | 0.99 |
| Close contact of patient with recent skin infection | 60 (18) | 52 (13) | 100 (5) | – | 0.07 |
| Homelessness | 14 (4) | 17 (4) | 0 (0) | – | 0.99 |
| Drug use | 10 (3) | 12 (3) | 0 (0) | – | 0.99 |
| Housing density, mean ± SD (range) | 1.3 ± 1 (0.25–3) | 1.4 ± 0.8 (0.25–3) | 1.0 ± 0.3 (0.66–1.3) | 0.50 (0.24–1.1) | 0.07 |
MRSA, methicillin-resistant Staphylococcus aureus; SD, standard deviation; Ref, reference group; recent surgery, patient reported undergoing surgery in the 12 months prior to enrollment; recent hospitalization, patient reported being hospitalized in the past 12 months prior to enrollment; close contact of patient with recent skin infection, someone that spends >20 h per week in the same space as the patient and had a skin infection in the past 6 months; homelessness, patient does not currently have a place to sleep or live; drug use, any illicit drug use in the past 12 months; housing density, number of people living in the patient's household divided by the number of bedrooms; –, unable to calculate due to zero cells.