Extract patient-level data from a Kaplan-Meier plot
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.
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
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