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Table 4 Sample size justification

From: Acupuncture as analgesia for low back pain, ankle sprain and migraine in emergency departments: Study protocol for a randomized controlled trial

Testing   Power Sample Size Equiv Limit True Diff Standard Deviation
Equivalence Ankle Sprain 0.81 35 1.5 0.0 1.95
  Migraine 0.80 35 1.5 0.0 1.96
  Low Back Pain 0.80 65 1.5 0.0 2.79
Non-Inferiority Ankle Sprain 0.80 70 1.5 0.0 3.25
  Migraine 0.80 60 1.5 0.0 2.98
  Low Back Pain 0.81 55 1.5 0.0 2.88