Figure 5. Mean plasma cortisol concentrations after a day’s work for “withdrawn” horses and “non- withdrawn” horses.

Data are given as boxplot diagrams showing medians (lines in the boxes), 25 and 75% quartiles (boxes) and minimum and maximum ranges (whiskers). “Withdrawn” horses had lower cortisol concentrations than non- withdrawn horses (i.e. that never performed the withdrawn posture). Mann Whitney test, * p<0.05.