According to the Bayesian cumulative link mixed-effects model, there was neither main effect of possibility (β̂ = 0.18, 95% CrI = [-0.12, 0.46]), main effect of perceived severity (β̂ = 3.31, 95% CrI = [-4.60, 10.39]), nor main effect of the degree of perceived severity (β̂ = -1.22, 95% CrI = [-4.87, 2.55]).
there was an interaction between possibility and perceived severity (β̂ = -0.85, 95% CrI = [-1.49, -0.23]).