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The Stata Journal
Volume 17 Number 4: pp. 786-802

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Reconstructing time-to-event data from published Kaplan–Meier curves

Yinghui Wei
Centre for Mathematical Sciences
School of Computing, Electronics, and Mathematics
Plymouth University
Plymouth, UK
Patrick Royston
MRC Clinical Trials Unit
University College London
London, UK
Abstract.  Hazard ratios can be approximated by data extracted from published Kaplan–Meier curves. Recently, this curve approach has been extended beyond hazard-ratio approximation with the capability of constructing time-to-event data at the individual level. In this article, we introduce a command, ipdfc, to implement the reconstruction method to convert Kaplan–Meier curves to time-to-event data. We give examples to illustrate how to use the command.
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