Print method function for survtab objects; see
survtab_ag.
# S3 method for survtab
print(x, subset = NULL, ...)a survtab object
a logical condition to subset results table by
before printing; use this to limit to a certain stratum. E.g.
subset = sex == "male"
arguments passed to print.data.table; try e.g.
top = 2 for numbers of rows in head and tail printed 
if the table is large, 
nrow = 100 for number of rows to print, etc.
Other survtab functions: lines.survtab,
  plot.survtab,
  summary.survtab, survtab_ag,
  survtab