Hello,
When not enough events occur, the median can be inestimable.
I seem to remember though that this question was asked before with satisfying answer, but cannot find it anymore.
But maybe you can use an alternative measure : RMST .
The restricted mean survival time (RMST), sometimes called the restricted mean event time, is an alternative measure that is more often reliably estimable than the mean and median of the event time in certain situations.
See this paper :
SAS Global Forum Proceedings -- Paper SAS3013-2019 Analyzing Restricted Mean Survival Time Using SAS/STAT® Changbin Guo and Yu Liang, SAS Institute Inc., Cary, NC https://www.sas.com/content/dam/SAS/support/en/sas-global-forum-proceedings/2019/3013-2019.pdf
Koen
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