Table 4:

Multivariate analysis of predictors of concordance between methicillin resistance on screening and Staphylococcus aureus clinical isolate

Variable*OR (95% CI)
Specimen taken from sterile site1.0 (0.4–2.5)
Antibiotics given between swab and isolate collection1.0 (0.4–2.1)
Age, yr†1.0 (0.98–1.02)
ICU v. non-ICU admission1.2 (0.5–2.7)
Sex (male v. female)1.3 (0.6–2.7)
Surgical v. medical unit0.9 (0.4–1.8)
Time between admission and isolate collection, d‡1.0 (0.99–1.0)
Swab and isolate collection on same admission2.1 (0.9–4.6)
Swab obtained within 48 h of isolate collection6.6 (1.6–28.2)

  • CI = confidence interval, ICU = intensive care unit, OR = odds ratio.

  • ↵* All dichotomous values as yes v. no unless stated otherwise.

  • ↵† OR per 1 year increase in age.

  • ↵‡ OR per day.