Table 2.

Hospital Quality Comparisons in terms of Performance Correlation, Outlier Status Agreement, and Change in Rank between the Model Excluding Wound Classification Variable and the Model Including Wound Classification Variable in ACS NSQIP (2011)

30-d postoperative outcomes	Hospital quality comparisons
	Performance correlation	Outlier status agreement	Absolute change in RANK
	R	Kappa	Mean	Median	Interquartile range
Surgical site infection (SSI)	0.9976	0.9508	4.5	3.0	(1.0, 6.0)
Superficial incisional SSI	0.9999	0.9872	0.9	1.0	(0.0, 2.0)
Deep incisional SSI	0.9978	0.9520	4.2	3.0	(1.0, 5.0)
Organ space SSI	0.9913	0.9007	9.9	6.0	(2.0, 14.0)
Sepsis or septic shock	0.9993	0.9845	2.3	2.0	(1,0, 3.0)
Wound disruption	0.9999	0.9907	0.9	1.0	(0.0, 1.0)
Cardiac event*	0.9999	0.9813	0.9	1.0	(0.0, 1.0)
Venous thromboembolism	0.9998	1.0000	1.6	1.0	(0.0, 2.0)
Pneumonia	0.9999	1.0000	0.7	0.0	(0.0, 1.0)
Reintubation	1.0000	1.0000	0.0	0.0	(0.0, 1.0)
Prolong ventilation (>= 48 hours)	0.9997	0.9877	0.7	1.0	(0.0, 3.0)
Urinary tract infection	0.9997	0.9832	1.7	1.0	(0.0, 3.0)
Renal failure	0.9998	1.0000	1.8	1.0	(0.0, 2.0)
Reoperation	0.9999	1.0000	1.1	1.0	(0.0, 2.0)
Mortality	0.9989	1.0000	3.0	2.0	(1.0, 5.0)

^*Cardiac event includes cardiac arrest requiring cardiopulmonary resuscitation and myocardial infarction.