file: OC.DAT
On: Ovarian cancer survival after a second look laparatomy (2LL)
Format: free
Variables:
1       Age at first diagnosis (years)
2       Grade at first diagnosis     1/2/3, 9=unknown
3       Stage at first diagnosis     1/2/3
4       Residual disease at 2LL      0/1/3/4
5       Treatment (p32) at 2LL
                0=not given
                1=given
6       Time from 2LL to recurrence (days)
7       Event indicator 0=no recurrence
                        1=recurrence occured