Claims-based SSI rates in the preintervention and postintervention periods
| Preintervention (May 2010 to April 2011) | Postintervention (November 2011 to September 2013) | |||||
| Procedures | Infection | SSI rate* (%) | Procedures | Infection | SSI rate* (%) | |
| Hip arthroplasty | ||||||
| Intervention states | 35 930 | 712 | 1.98 | 71 352 | 1172 | 1.64 |
| Comparison states | 38 355 | 837 | 2.18 | 74 321 | 1590 | 2.14 |
| Knee arthroplasty | ||||||
| Intervention states | 50 111 | 827 | 1.65 | 96 556 | 1257 | 1.30 |
| Comparison states | 58 682 | 960 | 1.64 | 108 692 | 1577 | 1.45 |
*Based on SSI codes (996.66, 996.67 and 998.59) in Medicare Part A Claims.
SSI, surgical site infection.