Figure 1.

Hair corticosterone levels of control rats (n = 9) and overcrowded rats (n = 9). Baseline values are those before overcrowding (postnatal day [PND] 38); those for PND 65 represent 27 d of overcrowding. Concentration data were log-transformed. For hair corticosterone analyses, 2-way nested mixed design ANOVA was used; different letters indicate that the values differ significantly (P < 0.01). Error bars indicate 1 SD. Posthoc univariate ANOVA were used to determinate specific group differences after overall ANOVA.