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Table 3 Cause-specific survival rates after one year of follow-up as predicted by the lognormal model compared with the actuarial results as calculated by the Kaplan-Meier method

From: Long-term survival rates of laryngeal cancer patients treated by radiation and surgery, radiation alone, and surgery alone : studied by lognormal and Kaplan-Meier survival methods

(A) Radiation and Surgery:
   Cause-specific survival rate (%)
Method Year 10 y 15 y 20 y 25 y C × 100%
Lognormal 1978 74 73 72 72 72
KM 1999 74 ± 3 72 ± 3 72 ± 3 72 ± 3 --
(B) Radiation alone:
   Cause-specific survival rate (%)
Method Year 10 y 15 y 20 y 25 y C × 100%
Lognormal 1978 71 69 68 68 67
KM 1999 71 ± 3 68 ± 3 68 ± 3 68 ± 3 --
(C) Surgery alone:
   Cause-specific survival rate (%)
Method Year 10 y 15 y 20 y 25 y C × 100%
Lognormal 1978 74 70 67 65 61
KM 1999 77 ± 3 72 ± 3 68 ± 3 66 ± 4 --
  1. y, year;
  2. C × 100%, cured rate estimated by the lognormal model;
  3. KM, Kaplan-Meier method ± one standard error.