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Table 1 Power calculations for the primary outcome of the study

From: Rationale and methods for a randomized controlled trial of a movement-to-music video program for decreasing sedentary time among mother-child pairs

Primary aim: decrease participants’ sedentariness by using movement-to-music video material
Sedentary time (mean 7 h 40 min, α = 0.05)    Intervention: Accelerometer and DVD group Control: Accelerometer group Number of participants (mother + child pair) needed per group
Reduction of sedentary time power effect size Mean SD Mean SD  
5.4 % β = 0.80 0.357 435 min 70 min 460 min 70 min 124
5.4 % β = 0.80 0.385 435 min 65 min 460 min 65 min 107
5.4 % β = 0.80 0.417 435 min 60 min 460 min 60 min 91
6.5 % β = 0.80 0.429 430 min 70 min 460 min 70 min 86
6.5 % β = 0.80 0.462 430 min 65 min 460 min 65 min 74
6.5 % β = 0.80 0.500 430 min 60 min 460 min 60 min 63
  1. α = significance level, β = power of the test
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