Table 3 A summary of the survival estimates at 6-month intervals along with corresponding confidence intervals

6 m survival (95% CI)

0.94 (0.94, 0.94)

0.77 (0.75, 0.78)

0.48 (0.45, 0.52)

0.39 (0.35, 0.43)

12 m survival (95% CI)

0.92 (0.92, 0.93)

0.70 (0.68, 0.71)

0.37 (0.34, 0.40)

0.28 (0.25, 0.31)

18 m survival (95% CI)

0.91 (0.91, 0.92)

0.65 (0.63, 0.66)

0.32 (0.29, 0.35)

0.22 (0.19, 0.25)

24 m survival (95% CI)

0.90 (0.89, 0.90)

0.59 (0.58, 0.61)

0.27 (0.24, 0.29)

0.18 (0.16, 0.20)