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Table III.

Risk factors for MRSA infection in dogs and cats retained in the final multivariable logistic regression model based on 176 records using animal as the unit of analysis (R 2 = 0.35). For variables with two categories the p-value is provided where as for variables with more than two categories an overall p-value based on a Wald-test is provided.

Variable Level OR 95% CI p-value Overall p-value
Number of antimicrobial courses 0.005
  None Ref.
  1 4.45 1.26–15.77 0.021
  2 5.78 1.54–21.65 0.009
  > 3 17.31 3.59–83.48 < 0.001
Number of days admitted 0.003
  None Ref.
  1 1.32 0.44–3.97 0.619
  > 1 5.27 1.62–17.10 0.006
Duration of infection
  < 2 months Ref.
  > 2 months 0.20 0.08–0.53 0.001
Surgical implant
  No Ref.
  Yes 32.98 4.59–236.86 0.001
At least two human in-contacts were ill (A)
  No Ref.
  Yes 0.11 0.02–0.78 0.027
At least one in-contact human has been admitted to hospital (B)
  No Ref.
  Yes 1.48 0.62–3.55 0.381
Interaction term: A*B 8.51 0.85–85.16 0.062

Ref.: reference category; OR: odds ratio; CI: confidence interval.