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Model-based recursive partitioning with all confounding variables for the influence of duration of mobilisation on ∆ MTB until ICU discharge. The minimum number of patients in each end node was set to 10% of the sample size. Blue points represent mean ∆ MTB until ICU discharge of each group. ATE were calculated using linear regression models. *= 0.001. ATE average treatment effects,MTB mobility-transfer-Barthel, ICU intensive care unit, SOMS Surgical ICU optimal mobilisation score
