all NA estimate for survival quartile estimate

[L777]

This is my code, but I just realized the result I have are all missing values.   I wonder how can I get the median survival time?

proc lifetest data=survival method=km;
time survival_time * event(0);
strata race;
run;

[OsoGris · Accepted solution]

You need to look at your survival curve/survival estimates.   If the curve doesn't drop below S(t) = 0.50 then the median does not exist.    I suspect the same for all of your other quartiles as well.   They may not exist for your data.