Incidence rate ratios from Poisson regression
| Fiscal year | Summary statistics—CLABSI rate | Time | ||||
| Mean | Median | 25% | 75% | IRR (95% CI) | p Value | |
| 2006 | 3.84 | 3.20 | 0.70 | 5.70 | Reference | |
| 2007 | 3.19 | 2.65 | 1.20 | 4.50 | 0.83 (0.73 to 0.94) | 0.0033 |
| 2008 | 2.44 | 2.10 | 0.50 | 3.50 | 0.65 (0.56 to 0.76) | <0.0001 |
| 2009 | 1.85 | 1.20 | 0.00 | 2.50 | 0.47 (0.40 to 0.55) | <0.0001 |
IRR, incidence rate ratio.