Fig. 3
From: Explaining the variation in the attained power of a stepped-wedge trial with unequal cluster sizes
The probability that the attained power falls more than 5 % below the nominal (left set of panels) or the expected (right set of panels) power by ICC. The risks decreased as ICC increased in all scenarios, except for the ones with 12 clusters. Panel labels identify the total number of clusters (first line) and the distribution of clusters to the cluster size groups S:L or S:M:L (second line)