VAP CR‐BSI CA‐UTI RR 95% CI RR 95% CI RR 95% CI Origin community 1 1 1 re‐admission ‡ 1.2 (0.2‐9.2) 1.6 (0.2‐12.7) other ward 0.8 (0.7‐1.1) 1.1 (0.6‐1.8) 0.8 (0.4‐1.4) other hospital (no ICU) 1.4 (0.9‐2.1) 0.8 (0.2‐3.2) 0.5 (0.2‐1.3) interaction with time 1.1** (1.0‐1.1) other ICU same hospital 0.7 (0.2‐2.3) ‡ ‡ ICU other hospital 0.5 (0.2‐1.2) 0.5 (0.1‐3.9) 0.2 (0.0‐1.7) * 0.05 < p < 0.1 ** p < 0.05 ‡ No cases in category ∆ Collinearity Analysis of risk factors for which interaction with time was significant was executed with interaction included for all categories. However only (marginally) significant interactions are shown or those that affected the relative risk of a risk factor substantially (SDD with UTI). 38 Chapter 2
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