Table S5.

Post hoc event model 1: Post hoc analysis of the effect of intergroup conflict and in-group affiliation on urinary oxytocin levels, log-transformed, with intergroup conflict without affiliation as the reference category

Term	Estimate	SE	χ2*	P
Intercept	5.549	0.236	–	–
Test predictor levels
Control without affiliation†	−1.197	0.171	43.294	<0.001
Control with affiliation†	−1.075	0.208	22.343	<0.001
Control with coordination†	−0.499	0.245	4.085	0.043
Intergroup conflict with affiliation†	0.136	0.14	0.933	0.334
Control predictors
Group‡	−0.319	0.127	5.916	0.015
Sex§	−0.307	0.200	2.292	0.130
Proximity¶	−0.035	0.057	0.378	0.538
Subgroup size#	0.082	0.049	2.714	0.099
Rank||	0.077	0.100	0.574	0.449

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 without affiliation, ^‡East group, and ^§female.

^¶,#,||z-transformed.