Table 4.

Relative risk of risk-adjusted outcomes in ACS-NSQIP hospitals and Non-ACS-NSQIP matched control hospitals assessed at 1-, 2- and 3- years following enrollment in simple pre-post (ACS-NSQIP hospitals after enrollment vs. before enrollment) and difference-indifference analysis

Adverse Outcome	Relative Risk of Adverse Outcome in ACS-NSQIP Hospitals After vs. Before Enrollment (95% CI)			Relative Risk of Adverse Outcomes After vs. Before Enrollment in ACS-NSQIP Compared to Control Hospitals (95% CI)*
	N=430,179 Post-enrollment			N=1,226,497 Post-enrollment
	Year 1	Year 2	Year 3	Year 1	Year 2	Year 3
Mortality	0.92 (0.85, 0.98)	0.76 (0.62, 0.9)	0.79 (0.59, 0.99)	0.96 (0.90, 1.02)	0.94 (0.88, 1.00)	0.96 (0.89, 1.03)
Serious complications	1.01 (0.97, 1.05)	0.99 (0.88, 1.09)	1.00 (0.86, 1.14)	1.00 (0.96, 1.03)	0.96 (0.93, 1.00)	0.96 (0.91, 1.00)
Reoperations	1.07 (0.91, 1.22)	1.15 (0.77, 1.53)	1.29 (0.86, 1.73)	1.14 (0.98, 1.31)	1.06 (0.90, 1.22)	0.97 (0.77, 1.16)
Readmissions	1.06 (1.02, 1.09)	1.12 (1.03, 1.20)	1.16 (1.05, 1.27)	1.04 (1.01, 1.07)	1.00 (0.97, 1.03)	0.99 (0.96, 1.03)

^*All models are adjusted for patient characteristics, comorbidities, year of surgery, procedure type, and hospital characteristics.