In addition to the adjusted boundary values and test results for the group sequential trial, the SEQTEST procedure also computes the following quantities:
average sample numbers (as percentages of the corresponding fixed-sample sizes for nonsurvival data or fixed-sample numbers of events for survival data) under various hypothetical references, including the null and alternative references
stopping probabilities at each stage under various hypothetical references to indicate how likely it is that the trial will stop at that stage
conditional power given the most recently observed statistic under specified hypothetical references
predictive power given the most recently observed statistic
repeated confidence intervals for the parameter from the observed statistic at each stage
parameter estimate, p-value for hypothesis testing, and median and confidence limits for the parameter at the conclusion of a sequential trial