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Table 4 Power calculation for different scenarios of baseline values and deltas of the probability of improvement at 1 year in the combined clinical end point (intention-to-treat analysis)

From: Efficacy and safety of venous angioplasty of the extracranial veins for multiple sclerosis. Brave dreams study (brain venous drainage exploited against multiple sclerosis): study protocol for a randomized controlled trial

 

Probability of improvement at 1 year in the control group

Delta of improvement in the experimental group

5%

10%

15%

15%

0.84

0.72

0.64

20%

0.97

0.92

0.87

25%

0.99

0.98

0.97