Table I.

Definition of Included Morbidities

Patient Death	The SRS defines patient death, as “death that is attributable to a complication of the surgery, or during the surgery.” NSQIP defines patient death as, “any mortality within 30-days of the operation.”
Wound Complication	NSQIP includes four categories of wound complications, including superficial surgical site infection, deep surgical site infection, organ space infection, and wound dehiscence, each within 30-days of the operation. In contrast, the SRS dataset includes only a single category titled “acute infections that occur at the operative site up to 12 weeks from the date of surgery.” The three types of infection from the NSQIP dataset were combined into a single “NSQIP wound complication” category for the purpose of comparison. Wound dehiscence was not included.
Neurologic Deficit	NSQIP contains a category for post-operative neurologic injury, which is defined as an, “injury to the nerve fibers, nerve cell body, or myelin sheath during surgery.” This category was compared against the SRS category termed, “new neurologic deficit.”
Blindness	NSQIP does not record post-operative blindness, and thus this morbidity was not included in our analysis.