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. Author manuscript; available in PMC: 2014 May 1.
Published in final edited form as: Ann Thorac Surg. 2012 Jun 15;94(2):564–572. doi: 10.1016/j.athoracsur.2012.01.105

Table 3.

Number of Outliers by Funnel Plots Stratified by STAT Category

All Participants STAT
Category 1		 STAT
Category 2		 STAT
Category 3		 STAT
Category 4		 STAT
Category 5
Number of participants 73 73 72 73 70
Number of operations 15,441 17,994 8,989 13,375 2,707
Number of outliers 3 1 7 13 13
Percentage of outliers 4.1% 1.4% 9.7% 17.8% 18.6%
Number of high-performing outliers 0 0 2 4 7
Percentage of high-performing outliers 0.0% 0.0% 2.8% 5.5% 10.0%
Number of low-performing outliers 3 1 5 9 6
Percentage of low-performing outliers 4.1% 1.4% 6.9% 12.3% 8.6%

STAT = The Society of Thoracic Surgeons (STS)-European Association for Cardio-Thoracic Surgery (EACTS) Congenital Heart Surgery Mortality Categories.