Table S6.

Post hoc event model 2: Post hoc analysis of the effect of intergroup conflict and in-group affiliation on urinary oxytocin levels, log-transformed, with intergroup conflict with affiliation as the reference category

Term	Estimate	SE	χ2*	P
Intercept	5.677	0.242	–	–
Test predictor levels
Control without affiliation†	−1.328	0.187	44.160	<0.001
Control with affiliation†	−1.205	0.219	25.042	<0.001
Control with coordination†	−0.633	0.256	5.973	0.015
Intergroup conflict without affiliation†	−0.128	0.130	0.968	0.325
Control predictors
Group‡	−0.321	0.126	6.110	0.013
Sex§	−0.302	0.198	2.274	0.132
Proximity¶	−0.037	0.058	0.411	0.521
Subgroup size#	0.082	0.049	2.770	0.096
Rank||	0.072	0.098	0.521	0.471

Statistically significant results (P ≤ 0.05) appear in bold.

^*Degrees of freedom are 1.

^†,‡,§χ² and P values refer to comparison with the reference categories ^†intergroup conflict with affiliation, ^‡East group, and ^§female.

^¶,#,||z-transformed.