Table 4.

Least square means (478 observations, 11 drivers and 9 horses) from model results with segment interquartile range rein tension as the outcome variable (modeled fourth-root transformed) and p-values for the corresponding main effects.

		Least square means			Type III
Variable	Category	Est	SE	Back-trans	p-value
Segment	WalkFLCircle	1.61	0.07	6.8	<0.0001
	CircStartLeft	2.30	0.06	27.8
	CircStartRight	2.35	0.06	30.7
	RacingLeft	1.79	0.06	10.3
	RacingRight	1.65	0.06	7.5
	SlowingLeft	2.06	0.06	17.8
	SlowingRight	1.85	0.06	11.6
	Trans2WLeft	1.62	0.06	6.9
	Trans2WRight	1.73	0.06	9.0
Repetition	1	1.95	0.06	14.5	0.19
Number	2	1.86	0.06	12.0
	3	1.84	0.06	11.5
Position	1	1.90	0.06	13.0	0.33
In the field	2	1.83	0.06	11.2
	3	1.93	0.06	13.7

The variables segment (gait and direction), repetition number (first, second and third test drive) and position in the field (1-first, 2-second, and 3-last) were forced. For explanation of segment acronyms, see Table 1.

Est- estimate, SE-standard error, Back-trans- back transformed.