Standardised infection rate ratio comparing CLABSI in VA ICUs with referent rates from National Healthcare Safety Network fiscal year 2009
| Observed CLABSI rates in FY2009 | NHSN CLABSI rates 2006–2008 | ||||||||
| ICU | NHSN group | CLABSI | Line days | CLABSI rate | Pred CLABSI | SIR | No. of CLABSI | No. of line days | CLABSI rate |
| Mixed LVL 1 | Medical surgical teaching | 59 | 33 568 | 1.76 | 70.76 | 0.83 | 1474 | 699 300 | 2.11 |
| Mixed LVL 2, 3, 4 | Medical surgical <15 | 71 | 43 683 | 1.63 | 65.34 | 1.09 | 1130 | 755 437 | 1.50 |
| Medical | Medical ICU | 37 | 184 03 | 2.01 | 42.34 | 0.87 | 2097 | 911 476 | 2.30 |
| Surgical | Surgical ICU | 127 | 68 953 | 1.84 | 158.97 | 0.80 | 1683 | 729 989 | 2.31 |
| Medical CCU | Med/CCU | 94 | 51 175 | 1.84 | 102.72 | 0.92 | 876 | 436 409 | 2.01 |
| VA overall | 388 | 215 782 | 1.80 | 440.13 | 0.88 | ||||
LVL, level; NHSN, National Healthcare Safety Network; CLABSI, central line-associated bloodstream infections; CLABSI rate, CLABSI divided by line days multiplied by 1000; Pred CLABSI, predicted VA CLABSI rates; NHSN CLABSI rate divided by 1000 times VA line days; SIR, standardised infection rate (observed number of CLABSI divided by the predicted CLABSI).