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Ann Thorac Surg 1982;34:146-156
© 1982 The Society of Thoracic Surgeons

Articles

Assessment and Comparison of the Performance of Cardiac Valves

Endre Bodnar, M.D.*, William H. Wain, Ph.D., Steven Haberman, M.A.

From the Department of Surgery, Cardiothoracic Institute, University of London, and the Department of Mathematics, The City University, London, England

Accepted for publication December 2, 1981.

* Address reprint requests to Dr. Bodnar, Department of Surgery, Cardiothoracic Institute, 2 Beaumont St, London W1N 2DX, England

A statistical method is presented to assess and compare cardiac valve performances. Patient survival and valve performances have been separated, and valve function and malfunction have been described in comprehensive and comparable terms. Formulas are proposed to calculate the significance of the difference between two survival probabilities as well as to calculate the instantaneous rate of events and the median remaining lifetime.




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