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J Thorac Cardiovasc Surg 2001;122:216-219
© 2001 The American Association for Thoracic Surgery
Statistics for the Rest of Us (STATS) |
From the Providence Health System, Portland, Ore.
Presented at The American Association for Thoracic Surgery Symposium on Adult Cardiac Surgery, May 6, 2001, San Diego, Calif.
Received for publication April 30, 2001. Accepted for publication May 21, 2001. Address for reprints: Gary Grunkemeier, PhD, 9155 SW Barnes, #33, Portland, OR 97225 (E-mail: ggrunkemeier{at}providence.org).
Abstract
Objective: To describe the cumulative incidence (actual) method of analysis and to contrast it with the Kaplan-Meier method.
Method: We use data on porcine valve replacement to illustrate these two statistical techniques.
Results: The "actual" analysis estimates the percentage of events expected to occur. The percentage given by the Kaplan-Meier method is much larger.
Conclusion: Actual (cumulative incidence) analysis is preferred for estimating the probability of occurrence of a nonfatal time-related event.
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