The COND_MRG output group in SURVIVAL consists of the estimates
of the conditional marginals, standard error of CONDMRG estimates, T-statistic
(CONDMRG / SE(CONDMRG)), and P-value for the test of hypothesis H0: CONDMRG=0.
This group is not printed by default, though the statistics are available
for individual printing, either by explicit use of appropriate keyword(s)
on the PRINT statement or by
COND_MRG=DEFAULT or COND_MRG=ALL on the PRINT statement. The keywords
in the COND_MRG group are listed below in default order.