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The probability of the bystander to intervene depending on the effects of z-standardized DDSI relationship scores between the two groomers (model 1.2; original mean = 0.553, s.d. = 0.111). 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 915 observations) as well as the model results (lines). No group differences were found.
