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Decision bounds and operating characteristics of the original group sequential adaptive plan.
| Stage | Infor-mation rate | Bounds accept H0 | Bounds reject H0 | Signifi-cance level (one-sided) | α spent | Power achieved | Sample size |
|---|---|---|---|---|---|---|---|
| 1 | 0.5 | – | 2.963 | 0.0015 | 0.0015 | 0.1647 | 2x309 |
| 2 | 1.0 | 1.969 | 1.969 | 0.0245 | 0.0250 | 0.8010 | 2x309 |
