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Table 1 Iterations of mean difference and standard deviations (SD). Estimates in cells are the calculated power given equal sample sizes in control and intervention group and common SD

From: “Stroke - 65 Plus. Continued Active Life”: a study protocol for a randomized controlled cross-sectoral trial of the effect of a novel self-management intervention to support elderly people after stroke

Power/ %

 

Mean difference/points

 

SD/points

1.5

2

2.5

3

3.5

1.5

96

100

100

100

100

2

79

96

100

100

100

2.5

60

84

96

100

100

3

45

69

86

96

100

3.5

35

56

75

88

96

  1. Iterations are based on a sample size of 56 patients allowing for a loss to follow-up of 20%. The power calculation closest to the feasibility study’s estimate of effect is marked in its cell in bold
  2. Note: effect size iterating from 1.5 points to 3.5 points in 4 steps of 0.5 points. The standard deviation is iterated from 1.5 points to 3.5 points in 4 steps of 0.5 points
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Trials

ISSN: 1745-6215