The COND_VAR output group in SURVIVAL consists of the estimate
of the conditional marginals, variance-covariance matrix for CONDMRG estimates,
denominator degrees of freedom and check for matrix inversion. 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_VAR=DEFAULT or COND_VAR=ALL on the PRINT statement.
The keywords in the COND_VAR group are listed below in default order.