Anyone draw Kaplan-Meier plotter by using
In my understanding, the median value of split patients should be the higher 50%, and the lower 50%.
If there is 3951 patient, the lower should be 1976, and the higher should be 1975. But when I input ABCC2 gene in breast cancer, the lower is 2020, and the higher is 1931.
My question is why the lower is not 1976, the higher is not 1975?
The result is:
Number at risk
Thanks in advance for great help.