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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 4.

Feasibility of Analyzing Between-Center Variation

Variable STAT
Category 1		 STAT
Category 2		 STAT
Category 3		 STAT
Category 4		 STAT
Category 5
Number of participants included in analysis 73 73 72 73 70
Aggregate mortality rate 0.55% 1.7% 2.6% 8.0% 18.4%
Sample size required for 50% power to detect 2× increase in
 mortality		 697 230 150 42 18
Number of participants meeting mortality requirement 3 31 21 62 44
Number of participants meeting PLOS requirement (≥5 cases) 73 73 71 71 60

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