Table 2.

Changes of cortisol concentration between ages of horses

Treatment1	Measurement time (Mean±SD)				Significance
	Basal	Exercise 1	Exercise 2	Exercise 3
A1	4.16A,a ±2.57	5.41A,a ±3.33	5.02A,a ±3.50	3.24A,a ±3.33	NS
A2	3.34A,a ±1.88	3.55B,a ±1.40	3.40B,a ±1.90	2.96A,a ±1.80	NS
A3	3.51A,a ±1.88	3.50B,a ±1.21	2.46B,a ±0.91	2.55A,a ±0.94	NS
A4	4.64A,a ±4.22	3.06B,ab ±1.51	2.48B,b ±1.64	2.49A,b ±0.86	*
Significance	NS	*	*	NS

SD, standard deviation.

¹A1, 1 to 5 years old; A2, 6 to 10 years old; A3, 11 to 15 years old; A4, 16 to 20 years old.

Levels of significance: NS, not significant;

^*p<0.05.

^a–bMeans with different superscripts in the same row significantly differ (p<0.05).

^A–BMeans with different superscripts in the same column significantly differ (p<0.05).