Table 1.

Matching criteria between the Society of Thoracic Surgeons and PERForm registries.

Match Type	Criteria
	Hospital NPI	CPB Time	Clamp Time	Date of Birth	Admission Date	Surgery Date
Match confidence level
Complete	Yes	±3 mins	±3 mins	Yes	Yes	Yes
High	Yes	±3 mins	±3 mins	Yes	Yes	No
				Yes	No	Yes
				No	Yes	Yes
Medium	Yes	±3 mins	±3 mins	Yes	No	No
				No	No	Yes
				No	Yes	No
Low	Yes	±3 mins	±3 mins			±2 days

NPI, National Provider Identifier; CPB, cardiopulmonary bypass.