Observed survival is an estimate of the probability of surviving all causes of death for a specified time interval calculated from the cohort of cancer cases. By selecting Observed Survival Only from the Cancer Survival Measures on the Statistic tab, the following statistics will be shown for each survival interval in the output life tables.
Number of cases entering the interval alive
Number of cases dying, lost to follow up, or withdrawn alive* during the interval
The adjusted number of alive* cases for each interval
Observed survival for the interval and the cumulative observed survival
Standard errors for both the interval and cumulative survival
*

These statistics do not appear in the results matrix unless selected from the matrix options. 