Figure 1.

Diagram of the timing of the intervention in the SEPREVEN stepped-wedge cluster randomised controlled trial. The trial lasts 20 months (M) per participating unit. Each randomization cluster (C) C1, C2 and C3 comprises 4 units. Intervention is implemented within each randomization cluster following a random sequence. The gray cells represent the (pre-educational) control periods, blue cells a 4-months transition phase and orange cells the (post-educational) intervention periods. The transition phase allows for the time to integrate the program into the units. During this transition period the unit is not in a control or intervention phase and does not contribute to primary endpoint analysis.