| EffDesign | HCT design with interim monitoring for efficacy only |
| EffIM | Monitoring the trial at interim looks for a trial with efficacy monitoring only |
| FutDesign | HCT design with interim monitoring for futiity only |
| FutIM | Monitoring the trial at interim looks for a trial with futility monitoring only |
| HCTSurvDesign | HCT design with interim monitoring for both efficacy and futility |
| IM | Monitoring the trial at interim looks for a trial with efficacy and futility boundaries |
| SM | Sample size in terms of number of subjects in the experimental group |