Analysis i | Time point | Hypothesis | Nominal level αi | Detectable effect δi | Power |
---|---|---|---|---|---|
1 | Interim analysis | Video vs. standard | 0.01 | 0.7 | 80% |
Video vs. non-video | 0.01 | 0.7 | 80% | ||
2 | Final analysis | Video vs. standard | 0.035 | 0.5 | 90% |
Video vs. non-video | 0.01 or 0.045 | 0.47 or 0.55 | 90% |