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Table 1 Representation of stepped wedge trial design showing four groups and five measurement time periods incorporating control (O) and intervention (X) phases

From: The prevention and reduction of weight loss in an acute tertiary care setting: protocol for a pragmatic stepped wedge randomised cluster trial (the PRoWL project)

   Time period
   1 2 3 4 5
Group/Step 1 (six wards) 0 X X X X
  2 (six wards) 0 0 X X X
  3 (six wards) 0 0 0 X X
  4 (seven wards) 0 0 0 0 X
  1. In this trial, 25 hospital wards are randomised to four groups–three groups of six wards and one group of seven wards.