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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