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Fig. 2 | Trials

Fig. 2

From: An imbalance in cluster sizes does not lead to notable loss of power in cross-sectional, stepped-wedge cluster randomised trials with a continuous outcome

Fig. 2

Power of stepped-wedge cluster randomised controlled trials (SW-CRTs) with varying number of steps, as variability in cluster size increases. The simulated power, relative to the analytical power, of SW-CRTs with increasing variability in cluster size, numbers of steps ranging from three to eight, average cluster size fixed at 20 and sample size calculated using the Woertman et al. design effect (DE) [7]. The type I error, power, intracluster correlation coefficient (ICC) and effect size were 0.05, 80%, 0.05 and 0.2, respectively

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Trials

ISSN: 1745-6215