Unequal cluster sizes in stepped-wedge cluster randomised trials: a systematic review.

Caroline A KristunasTom MorrisLaura Gray

Published in: BMJ open (2017)

Cluster sizes often vary in SW-CRTs. Reporting of SW-CRTs also remains suboptimal. The effect of unequal cluster sizes on the statistical power of SW-CRTs needs further exploration and methods appropriate to studies with unequal cluster sizes need to be employed.

Keyphrases

clinical trial
randomized controlled trial
emergency department