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Table 4 Power calculation In order to have 80% or 90% power for the analysis of reduction in function scores (change) we would need (per study arm)

From: Randomized clinical trial of surgery versus conservative therapy for carpal tunnel syndrome [ISRCTN84286481]

  m1-m0
  0.20 0.30 0.40 0.50
80% power 298 133 75 48
90% power 399 177 100 64