Extract patient-level data from a Kaplan-Meier plot

Last updated on Jun 1, 2020 1 min read

I made a video with step-by-step instructions for extracting (approximate) patient-level data from a Kaplan-Meier curve. It’s a useful thing to be able to do, and while there are plenty of references already (see below) I thought perhaps a full guide using completely free software was missing.

References

Guyot, P., Ades, A., Ouwens, M.J. et al. Enhanced secondary analysis of survival data: reconstructing the data from published Kaplan-Meier survival curves. BMC Med Res Methodol 12, 9 (2012). https://doi.org/10.1186/1471-2288-12-9

Wei, Y., & Royston, P. (2017). Reconstructing Time-to-event Data from Published Kaplan–Meier Curves. The Stata Journal, 17(4), 786–802. https://doi.org/10.1177/1536867X1801700402

Author: Ankit Rohatgi Title: WebPlotDigitizer Website: https://automeris.io/WebPlotDigitizer Version: 4.2 Date: April, 2019 E-Mail: Location: San Francisco, California, USA

https://github.com/giabaio/survHE/blob/master/R/digitise.R

Satagopan, Jaya M., Alexia Iasonos, and Joseph G. Kanik. “A reconstructed melanoma data set for evaluating differential treatment benefit according to biomarker subgroups.” Data in brief 12 (2017): 667-675. https://doi.org/10.1016/j.dib.2017.05.005

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Dominic Magirr
Medical Statistician

Interested in the design, analysis and interpretation of clinical trials.