Repeatability of endocrine traits and dominance rank in female guinea pigs

Table 3 Model summary from the linear mixed effect model utilized to determine whether dominance rank index was correlated to cortisol concentrations, controlling for potential effects of body weight, habituation (measurement), and housing group

Fixed effects		Estimate	SE	df	t value	p
Intercept		556.109	87.590	59.815	6.349
Sample	Responsiveness 1 h	894.135	154.773	11.149	5.777	< 0.001
Sample	Responsiveness 2 h	1338.281	179.651	10.783	7.449	< 0.001
Rank		− 400.137	315.970	58.673	− 1.266	0.210
Sample * rank	Responsiveness 1 h	− 259.510	536.034	25.732	− 0.484	0.632
Sample * rank	Responsiveness 2 h	− 122.233	606.082	26.501	− 0.202	0.842
Body weight		0.451	0.951	29.957	0.474	0.639
Measurement		70.977	91.711	47.019	0.774	0.443
Housing group		175.618	97.352	27.083	1.804	0.082

Bold indicates significant terms (p < 0.05); italics indicates trend (0.05 ≤ p < 0.1). N = 72 observations (12 individuals, two measurements of three samples each)

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