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Table 3 Demographical and historical variables: overall, and MRSA vs. non-MRSA

From: Skin and soft-tissue infections in suburban primary care: epidemiology of methicillin-resistant Staphylococcus aureus and observations on abscess management

  All isolates, No. (%) MRSA, No. (%) Non-MRSA, No. (%) Unadjusted OR (95% CI) Adjusted OR (95% CI)*
  (N = 529) (N = 115) (N = 414)   
Age < 65 years 432 (82) 104 (90) 328 (79) 2.47 (1.3-4.8) 2.25 (1.0-4.9), P = 0.002
Male sex 296 (56) 67 (58) 229 (55) 1.12 (0.7-1.7) -
Itching† 92 (17) 29 (25) 63 (15) 1.88 (1.1-3.1) -
Trauma† 167 (32) 24 (21) 143 (35) 0.50 (0.3-0.8) -
Surgery† 37 (7) 5 (4) 32 (8) 0.54 (0.2-1.4) -
Insect bite 75 (14) 33 (29) 42 (10) 3.56 (2.1-6.0) 4.18 (2.4-7.4), P < 0.001
Prior MRSA 26 (5) 23 (20) 3 (1) 34.3 (10.1-116.5) 41.05 (11.4-147.3), P < 0.001
Contact MRSA‡ 22 (4) 17 (15) 5 (1) 14.18 (5.1-39.4) 12.83 (4.2-39.2), P < 0.001
Allergic rhinitis 79 (15) 19 (17) 60 (15) 1.17 (0.7-2.0) -
Eczema 48 (9) 9 (8) 39 (9) 0.82 (0.4-1.7) -
Diabetes 40 (8) 10 (9) 30 (7) 1.22 (0.6-2.6) -
Current antibiotic§ 112 (21) 31 (27) 81 (20) 1.52 (0.9-2.4) 2.21 (1.3-3.8), P = 0.05
Hospitalization¶ 41 (8) 9 (8) 32 (8) 1.01 (0.5-2.2) -
  1. Abbreviations: MRSA, methicillin-resistant Staphylococcus aureus; OR, odds ratio; CI, confidence interval.
  2. *Adjusted for age <65, insect bite, previous MRSA, contact with MRSA patient, and current antibiotic use.
  3. †A history of acute itching, trauma, recent surgery, or possible insect bite refers to the infected area.
  4. ‡A person with a prior history of MRSA with whom the patient had close contact (e.g. a household member).
  5. §Current antibiotic refers to an antibiotic the patient was already taking at study entry.
  6. ¶Admission to hospital, skilled nursing facility, or dialysis unit in the last 12 months.