Table 1.

Newly created categories for multivariate multinomial analysis using existing NHSN procedure category groups for SSI monitoring. The NHSN pacemaker group was omitted from analysis. AVSD: Shunt for dialysis.

New categories (n = 15)	NHSN categories (n = 38)
Caesarean section	Caesarean section
Hernia	Hernia
Abdominal	Gallbladder, colon, appendectomy, gastric, biliary, small bowel, rectal, spleen, exploratory laparotomy
Breast	Breast
Prosthesis	Knee prosthesis, hip prosthesis
Fracture	Fracture
Spine	Laminectomy, fusion
Gynecology	Ovary, hysterectomy, vaginal hysterectomy
Thoracic	Thoracic, cardiac, coronary artery bypass
Neuro	Cranial, ventricular shunt
Neck	Thyroid, neck
Amputation	Amputation
Urology	Prostate, kidney
Vascular	AVSD, peripheral bypass, abdominal aortic aneurysm, carotid endarterectomy
Transplant	Kidney transplant, liver transplant, heart transplant