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Sample size calculations for cluster randomised controlled trials with a fixed number of clusters

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Figure

Figure 1 Maximum achievable power for various different standardised effect sizes: limiting values as the cluster size approachesinfinity.
Figure 2 Maximum achievable power to detect increases in 10 percentage points for various different baseline proportions (limiting values as the cluster size approaches infinityπ1):.
Figure 3 Minimum detectable difference (effect size) at 80%power for continuous outcomes: limiting values as the clustersize approaches infinity.
Table 1 Estimates of the Minimum Detectable Difference(MDD) for trial with 20 clusters per arm, to detect anincrease in an event rate from 40%

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