Table 1.

Absolute increase of plasma cortisol values in a stress reactivity test

		Early adolescence	Late adolescence
R1-I (ng/ml)	Median domestic	586.5	872
	Median wild	1683	1609
	U	0	0
	p	0.001	0.001
R2-I (ng/ml)	Median domestic	1059.5	1308,5
	Median wild	2438	2208
	U	0	6
	p	0.001	0.001
R3-I (ng/ml)	Median domestic	1052	1056
	Median wild	2563	1836
	U	4	2
	p	0.001	0.001
R4-I (ng/ml)	Median domestic	717	714,5
	Median wild	1927	1843
	U	2	0
	p	0.001	0.001
MAX-I (ng/ml)	Median domestic	1133.5	1436.5
	Median wild	2574	2208
	U	0	0
	p	0.001	0.001

Domestic guinea pigs and wild cavies were transferred from their familiar home enclosure to a novel enclosure for four hours. The absolute increase from initial values (I, in home enclosure) to values after 1 h (R1), 2 h (R2), 3 h (R3), and 4 h (R4) in the novel enclosure as well as from I to the maximal response value (MAX, maximum value of R1-R4) are shown. The responses of guinea pigs and cavies were compared during early and late adolescence. N_domestic = 10, N_wild early = 8, N_wild late = 7. Significant p-values are highlighted in boldface.