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Table 3 Anticipated power for a range of effect sizes across outcome measures with six clusters per arm, not accounting for losses to follow-up

From: Research Exploring Physical Activity in Care Homes (REACH): study protocol for a randomised controlled trial

Effect size

ICC

Power (cluster size = 8)

Power (cluster size = 12)

0.40

0.05

65%

74%

 

0.10

59%

65%

0.50

0.05

79%

87%

 

0.10

72%

78%

0.60

0.05

89%

94%

 

0.10

83%

88%

  1. ICC intra-class correlation coefficient (which represents the amount of correlation between observations (residents) within a cluster (care home))
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Trials

ISSN: 1745-6215