Medical College of Wisconsin
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Analyzing survival curves at a fixed point in time. Stat Med 2007 Oct 30;26(24):4505-19 PMID: 17348080

Pubmed ID



A common problem encountered in many medical applications is the comparison of survival curves. Often, rather than comparison of the entire survival curves, interest is focused on the comparison at a fixed point in time. In most cases, the naive test based on a difference in the estimates of survival is used for this comparison. In this note, we examine the performance of alternatives to the naive test. These include tests based on a number of transformations of the survival function and a test based on a generalized linear model for pseudo-observations. The type I errors and power of these tests for a variety of sample sizes are compared by a Monte Carlo study. We also discuss how these tests may be extended to situations where the data are stratified. The pseudo-value approach is also applicable in more detailed regression analysis of the survival probability at a fixed point in time. The methods are illustrated on a study comparing survival for autologous and allogeneic bone marrow transplants.

Author List

Klein JP, Logan B, Harhoff M, Andersen PK


Brent R. Logan PhD Director, Professor in the Institute for Health and Equity department at Medical College of Wisconsin


2-s2.0-35148838428   123 Citations

MESH terms used to index this publication - Major topics in bold

Bone Marrow Transplantation
Disease-Free Survival
Kaplan-Meier Estimate
Linear Models
Models, Statistical
Monte Carlo Method
Time Factors
Transplantation, Autologous
Transplantation, Homologous
jenkins-FCD Prod-332 f92a19b0ec5e8e1eff783fac390ec127e367c2b5