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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

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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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