Table 1

Demographic, clinical, and MRSA risk factors of populationa

Characteristic% (no.) of patientsP 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
    Male42 (13)35 (9)80 (4)Ref
    Female58 (18)65 (17)20 (1)5.5 (0.02–1.7)0.13
Ethnicity
    Caucasian45 (14)46 (12)40 (2)Ref
    Hispanic32 (10)31 (8)40 (2)1.4 (0.24–8.3)0.71
    Other23 (7)23 (6)20 (1)1.0 (0.11–9.2)0.99
Comorbidities
    Diabetes6 (2)8 (2)0 (0)0.99
    Hypertension16 (5)19 (5)0 (0)0.56
    Cancer6 (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 regimen81 (25)77 (20)100 (5)0.55
    Recent surgery6 (2)8 (2)0 (0)0.13
    Recent hospitalization36 (11)42 (11)0 (0)0.99
    Healthcare worker19 (6)19 (5)20 (1)0.95 (0.13-7.1)0.99
    Close contact of patient with recent skin infection60 (18)52 (13)100 (5)0.07
    Homelessness14 (4)17 (4)0 (0)0.99
    Drug use10 (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
  • a 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.