No of 5-year relative S.E. % of lost Median
  patients survival rate     (months)
Total 5928 26.49 1.34 12.38 8.83
1-2 st.treated 756 56.6 4.53 25.53
1-2 st.not treated 305 44.21 7.09 21.97 25.9
3 st. treated 1583 46.59 3.03 17.63 48.51
3 st.not treated 808 18.12 3.36 12.62 7.68
4 st.treated 517 7.71 2.93 5.8 5.18
4 st.not treated 1463 1.98 0.9 2.26 1.87