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Previous Volume 342:1527-1528 May 18, 2000 Number 20 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Edwards et al.¹ (Dec. 30 issue) compared the one-year survival at centers performing 20 or fewer liver transplantations per year with survival at centers performing more than 20 transplantations per year and found excess mortality in the former group.

The authors seek to determine a turning point for experience. Unfortunately, they did not choose a priori categories. They justified their choice of the number 20 by appealing to their Figure 1. They state that "mortality rates stabilized at centers that performed more than 20 transplantations per year and increased inversely with transplantation volumes of less than 20 . . . [Full Text of this Article]

References

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• Birkmeyer, J. D., Siewers, A. E., Finlayson, E. V.A., Stukel, T. A., Lucas, F. L., Batista, I., Welch, H. G., Wennberg, D. E. (2002). Hospital Volume and Surgical Mortality in the United States. NEJM 346: 1128-1137 [Abstract] [Full Text]  
• Spiegelhalter, D. J (2002). Mortality and volume of cases in paediatric cardiac surgery: retrospective study based on routinely collected data. BMJ 324: 261-261 [Abstract] [Full Text]