Encounter-based randomization did not result in contamination in a shared decision-making trial: a secondary analysis

OBJECTIVES: To estimate the level of contamination in an encounter-randomized trial evaluating a shared decision-making (SDM) tool. STUDY DESIGN AND SETTING: We assessed contamination at three levels: (1) tool contamination (whether the tool was physically present in the usual care encounter), (2) functional contamination (whether components of the SDM tool were recreated in the usual care encounters without directly accessing the tool), and …