Figure 3.

The probability of the bystander to intervene depending on the effects of z-standardized DDSI relationship scores between the bystander and the PG (a; original mean = 0.565, s.d. = 0.099), and the bystander and NPG (b; original mean = 0. 468, s.d. = 0.073). Shown are the observed probabilities to intervene into a grooming bout of average duration (larger point areas denote a larger number of observations (range 1 to 888 observations)) as well as the model results (model 1.2, lines). No group differences were found for either predictor.