Table 3.

Mixed effects Cox proportional hazards model. Time to first aggressive behavior was predicted by the interaction of the mass difference between tadpoles and their relatedness; family is taken into account as a random effect. There is a significant interaction between relatedness and mass, where siblings of similar masses have a shorter latency to aggression than non-siblings. Mass_Diff is the difference in weight between large and small tadpoles

	Latency to first bite
Predictors	Estimate	CI	z	P
Half-siblings	−1.27	−2.83–0.30	−1.59	0.113
Siblings	−1.44	−3.12–0.24	−1.68	0.093
Mass_Diff	0.89	−8.65–10.44	0.18	0.854
Half-siblings: Mass_Diff	9.62	−2.14–21.38	1.60	0.109
Siblings: Mass_Diff	16.32	1.80–30.83	2.20	0.028

Bold values represent significant values.