Salivary cortisol concentrations in the environmentally enriched and control groups.

<p>Salivary samples were collected 0, 6, and 12 weeks after the beginning of the treatment, in the morning (1000 h) or in the afternoon (1530 h). ***intergroup comparison, Mann–Whitney test, P≤0.001; ⁺⁺intragroup comparison, Wilcoxon tests, P≤0.01.