No of 5-year relative S.E. % of lost Median
  patients survival rate     (months)
Total 20906 8.67 0.49 6.4 5.58
1-2 st.treated 1071 28.78 3.35 15.59 23.38
1-2 st.not treated 1411 19.93 2.88 15.03 14.61
3 st. treated 3660 12.75 1.3 7.02 9.88
3 st.not treated 5096 8.99 1.08 7.99 7.53
4 st.treated 1503 3.1 1.07 2.46 4.56
4 st.not treated 6633 2.38 0.51 2.79 2.21