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Table 2 Power of analysis of primary endpoint under different assumptions for the design effect

From: Evaluation of a self-management patient education program for patients with chronic heart failure undergoing inpatient cardiac rehabilitation: study protocol of a cluster randomized controlled trial

ICC 0.01 0.02 0.05 0.08 0.01 0.02 0.05 0.08 0.01 0.02 0.05 0.08
Cluster size 5 5 5 5 10 10 10 10 15 15 15 15
Design effect 1.04 1.08 1.20 1.32 1.09 1.18 1.45 1.72 1.14 1.28 1.70 2.12
Power (1-β) 0.85 0.84 0.79 0.76 0.83 0.80 0.72 0.64 0.81 0.77 0.65 0.55
  1. Bold figures indicate: data for sample size calculation with expected effect size of 0.30 and resulting sample size n = 416.