Annual risk-adjusted standardised infection ratio (SIR) of observed over predicted deep incisional primary and organ/space surgical site infections (SSIs), over a 30-day post-operative surveillance period, and the patient underwent a colon surgery (COLO) or abdominal hysterectomy (HYST) at an acute care hospital or oncology hospital.

Number of annually observed hospitalised patients who underwent a COLO or HYST and developed a deep incisional primary or organ/space SSI within the 30-day postoperative surveillance period (includes SSIs detected upon re/admission to the facility and via post-discharge surveillance).

Number of annually predicted hospitalised patients who underwent a COLO or HYST and developed a deep incisional primary or organ/space SSI within the 30-day postoperative surveillance period (includes SSIs detected upon re/admission to the facility and via post-discharge surveillance).

• Procedures that develop a postoperative surgical site infection (SSI) and the infection is present at the time of surgery, the SSI event and surgical procedure are excluded • ASA class VI • Patients whose admission date and discharge date are the same day • Patients >= 109 years of age • Adult patient's, >=18 years of age, BMI is less than 12 or greater than 60 • Procedures reported in patients with gender reported as Other are excluded from the SSI SIR • Surgical procedure duration less than 5 minutes or exceeding the IQR5 value

Multivariate logistic regression model: procedure duration, BMI, patient age, ASA score, use of scope, facility's medical school affiliation, facility type, patient diagnosis of diabetes, facility bed size, patient's wound class, emergency status of procedure, use of anaesthesia, trauma classification, type of wound closure, and patient gender.

By hospital and state.

Hospital information submitted to the National Healthcare Safety Network (NHSN)

HAC Reduction Program data is displayed at data.cms.gov

www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps/hospital-acquired-condition-reduction-program-hacrp

p4qm.org/measures/0753