Effect sizes of the learning processes in formal groups over time.

Hierarchical cross-classified data analyses reveal that the intervention groups A and B perceive higher group learning processes in curriculum year 2 compared to the control group (C) at observation 0, the start of the module. GLB: Group learning behaviour, Potency: Group Potency, Cohesion: Social cohesion, Safety: Psychological Safety. Effect sizes are given in regression coefficients, with standard errors between brackets. Obs 0: starting point in the module. Slope: increase (β) between the start and the end of the module. C = control group, A & B are the intervention groups (small subsets), and nR is the non-randomised group of students.*signifies p-value≤0.05.