No of 5-year relative S.E. % of lost Median
  patients survival rate     (months)
Total 10789 48.8 1.12 21.63 57.51
1-2 st.treated 4876 72.39 1.59 30.09  
1-2 st.not treated 999 43.87 4.02 29.63 48.83
3 st. treated 2401 41.74 2.26 14.62 46.96
3 st.not treated 630 15.6 3.46 12.7 20.43
4 st.treated 621 10.68 2.92 9.34 15.81
4 st.not treated 865 3.01 1.47 4.39 4.7