Dear listers,
using stata v10.1 I obtain different results in my dataset for the
median survival using stsum and stdes for the dataset, i.e.
. stdes
failure _d: status_fu == 0
analysis time _t: cox_time
|-------------- per subject --------------|
Category total mean min median max
------------------------------------------------------------------------------
no. of subjects 516
no. of records 516 1 1 1 1
(first) entry time 0 0 0 0
(final) exit time 11.66499 .0666667 9.633333 74.9
subjects with gap 0
time on gap if gap 0
time at risk 6019.1333 11.66499 .0666667 9.633333 74.9
failures 453 .877907 0 1 1
------------------------------------------------------------------------------
. help sts
. stsum
failure _d: status_fu == 0
analysis time _t: cox_time
| incidence no. of |------ Survival time -----|
| time at risk rate subjects 25% 50% 75%
---------+---------------------------------------------------------------------
total | 6019.133335 .07526 516 4.733333 10.06667 17.03333
What is the difference in median time at risk per subject and median
survival time? Which one to report?
regards,
M
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