Table 1.

Frequencies of occurrence of behavioural patterns, the index of emotionality and the index of laterality obtained from nine horses after a sudden experimental stress consisting in opening an umbrella in front of them. Horses’ behaviour was recorded during 1 min by scan sampling (30 scans/min).

	Horse 1	Horse 2	Horse 3	Horse 4	Horse 5	Horse 6	Horse 7	Horse 8	Horse 9	Mean/Median 1
Behavioural patterns, frequencies of occurrence (%)
Standing quietly immobile	10	13	94	0	37	45	6	0	42	13 [3.0–43.5]
Slow/exploratory walk	0	0	0	0	0	16	42	3	39	0 [0.0–27.5]
Sniffing at the ground	0	3	10	0	10	55	0	3	0	3 [0.0–10.0]
Sustained walk	26	55	0	26	13	0	0	23	0	13 [0.0–26.0]
Trot	6	3	0	19	7	0	0	13	0	3 [0.0–10.0]
Gallop	0	0	0	0	3	0	0	10	0	0 [0.0–1.5]
Passage	0	3	0	0	0	0	0	6	0	0 [0.0–1.5]
Vigilance	56	26	6	55	43	3	45	29	19	31 (16.2–46.5)
Tail posture	0	3	0	19	0	0	0	26	0	0 [0.0–11.0]
Alarm	0	0	0	0	0	0	0	3	0	0 [0.0–0.0]
Snoring/blowing	0	12	0	27	14	0	0	10	0	0 [0.0–27.0]
Looking at the umbrella	69	55	23	97	73	16	19	77	17	49 (25.5–73.4)
with both eyes	63	32	13	65	63	10	19	45	3	31 (13.1–49.9)
with the right eye	3	13	10	19	3	6	0	26	14	10 (3.9–17.0)
with the left eye	3	10	0	13	7	0	0	6	0	4 (0.5–8.1)
Ear orientation
axial ear	10	10	17	3	4	77	29	3	7	10 [3.5–23.0]
backward ear	7	7	31	3	15	6	14	0	39	7 [4.5–23.0]
forward ear	77	70	34	77	78	13	50	90	50	60 (40.7–79.1)
mixing ear	7	13	17	16	4	3	7	6	4	8 (4.4–12.7)
Index of emotionality	94	114	8	212	114	36	69	247	36	103 (36.0–212.0)
Index of laterality	0	0.14	1.00	0.20	−0.33	1.00	0	0.60	1.00	0.40 (0.001–0.793)

¹ Mean (95% confidence interval); Median [interquartile range, 25th–75th percentiles].