TABLE 3.

Results from final model, the pair wise comparisons of each pair of 3rd and 1st odor presentations, with sample size, estimate ± se, df, t-ratio and P listed.

Third vs first odor presentations	N	Pairwise comparison Estimate ± se,	Df	t-ratio	P
Orange 3rd vs. peppermint 1st	9	−24.63 ± 1.47	364	−16.78	<0.001
Orange 3rd vs. lavender 1st	8	−13.03 ± 1.46	365	−8.77	<0.001
Orange 3rd vs. cedar wood 1st	9	−12.38 ± 1.49	365	−8.34	<0.001
Peppermint 3rd vs. orange 1st	9	−2.58 ± 1.47	364	−1.76	0.84
Peppermint 3rd vs. lavender 1st	9	−2.01 ± 1.49	365	−1.35	0.97
Peppermint 3rd vs. cedar wood 1st	8	−1.36 ± 1.49	365	−0.92	1.00
Lavender 3rd vs. orange 1st	9	−14.19 ± 1.49	365	−9.51	<0.001
Lavender 3rd vs. peppermint 1st	9	−25.21 ± 1.49	365	−16.90	<0.001
Lavender 3rd vs. cedar wood 1st	9	−12.97 ± 1.51	367	−8.59	<0.001
Cedar wood 3rd vs. orange 1st	9	−14.83 ± 1.49	365	−9.94	<0.001
Cedar wood 3rd vs. peppermint 1st	9	−25.85 ± 1.49	365	−17.33	<0.001
Cedar wood 3rd vs. lavender 1st	8	−13.61 ± 0.97	364	−14.01	<0.001

During the course of the experiment, sniffing duration of the four odors did not vary between presentations regardless of odor (Figure 2A, Anova: F_df = 0.50₉, P = 0.87), indicating that the horses’ interest in the test situation/the odors persisted over time (total test duration per horse: 20 min).