Fig. 3From: Stepped wedge cluster randomized controlled trial designs: a review of reporting quality and design featuresDesign characteristics of SW-CRCTs. (a) Number of clusters and (b) time period between steps of the included studies (where clear) is depicted, according to whether the study record is either a completed report or other record type (trial registrations, protocols, conference reports). For completed reports, the final true figures are used; for the other records, the planned amounts are employed. For the box plot of the time periods between steps, 1Â month was treated as 4Â weeks and 1Â year as 52Â weeks. Notches are used to display the 95% confidence interval for the median, and the boxplot widths are proportional to the square root of the number of records on which they are basedBack to article page