Table 4. Length of stay and hospital charges a within 90 days of surgery attributable to surgical site infection (SSI) due to methicillin resistant Staphylococcus aureus (MRSA): SSI due to MRSA compared to uninfected controls.
| Length of Stay Least Squares Mean (IQR) | Charges Least Squares Mean (IQR) | |||
| Unadjusted | Adjusted b | Unadjusted | Adjusted c | |
| Cases | 23.6 (21.7–25.5) | 28.3 (25.7–30.8) | 105,214 (91,458–118,971) | 112,144 (85,850–138,438) |
| Controls | 5.2 (3.7–6.7) | 5.2 (3.5–7.0) | 47,099 (35,485–58,714) | 50,463 (34,551–66,375) |
| Attributable difference | 18.4 (16.0–20.8) | 23.0 (19.7–26.3) | 58,115 (40,111–76,119) | 61,681 (23,352–100,011) |
Charges were normalized to year 2003 by adjusting for inflation at a rate of 0.03% per year.
Adjusted for procedure at tertiary care hospital, need assistance with ≥3 ADLs, post-operative serum glucose >200 mg/dL, orthopedic procedure, caucasian race, McCabe score = 1, male sex, coronary artery bypass graft procedures, surgical duration >75th NNIS percentile, and contained a term for the interaction of MRSA SSI and need assistance with 3 or more ADLs.
Adjusted for procedure at tertiary care hospital, coronary artery bypass graft procedure, surgical duration >75th NNIS percentile, procedure on same day as admission, ASA score ≥3, the interaction between MRSA SSI and need assistance with 3 or more ADLs and the interaction between MRSA SSI and procedure at a tertiary care hospital.