figure 2. The distribution of standardized infection ratios (SIRs) within each hospital referral region (HRR), with a separate panel for each healthcare-associated infection. In each panel, a separate boxplot is shown for each HRR. The upward-pointing triangles (▲) below the boxplots indicate that a given HRR has one or more hospitals with SIR<0.05. The vertical axis has been rescaled so that SIRs<1 occupy the same amount of vertical space as SIRs>1. The horizontal line indicates SIR=1.